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Finding the Fourth Proportional to 714,012.92, 985,401.56 and 391,785.76

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Solution

The fourth proportional to 714,012.92, 985,401.56 and 391,785.76 is: 540,699.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,012.92 : 985,401.56 = 391,785.76 : x
  2. Step 2: Convert to fraction form
    714,012.92/985,401.56 = 391,785.76/x
  3. Step 3: Cross multiply
    714,012.92x = 985,401.56 × 391,785.76
  4. Step 4: Simplify right side
    714,012.92x = 386,066,299,089.79
  5. Step 5: Solve for x
    x = 386,066,299,089.79/714,012.92
  6. Step 6: Final answer
    x = 540,699.32

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.