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Finding the Fourth Proportional to 714,240.48, 985,663.89 and 391,980.57

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Solution

The fourth proportional to 714,240.48, 985,663.89 and 391,980.57 is: 540,939.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,240.48 : 985,663.89 = 391,980.57 : x
  2. Step 2: Convert to fraction form
    714,240.48/985,663.89 = 391,980.57/x
  3. Step 3: Cross multiply
    714,240.48x = 985,663.89 × 391,980.57
  4. Step 4: Simplify right side
    714,240.48x = 386,361,089,734.38
  5. Step 5: Solve for x
    x = 386,361,089,734.38/714,240.48
  6. Step 6: Final answer
    x = 540,939.78

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Double scale
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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.