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Finding the Fourth Proportional to 714,161.20, 985,509.42 and 391,863.28

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Solution

The fourth proportional to 714,161.20, 985,509.42 and 391,863.28 is: 540,753.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,161.20 : 985,509.42 = 391,863.28 : x
  2. Step 2: Convert to fraction form
    714,161.20/985,509.42 = 391,863.28/x
  3. Step 3: Cross multiply
    714,161.20x = 985,509.42 × 391,863.28
  4. Step 4: Simplify right side
    714,161.20x = 386,184,953,792.10
  5. Step 5: Solve for x
    x = 386,184,953,792.10/714,161.20
  6. Step 6: Final answer
    x = 540,753.20

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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.