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Finding the Fourth Proportional to 781.47, 1,078.38 and 432.15

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Solution

The fourth proportional to 781.47, 1,078.38 and 432.15 is: 596.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.47 : 1,078.38 = 432.15 : x
  2. Step 2: Convert to fraction form
    781.47/1,078.38 = 432.15/x
  3. Step 3: Cross multiply
    781.47x = 1,078.38 × 432.15
  4. Step 4: Simplify right side
    781.47x = 466,021.92
  5. Step 5: Solve for x
    x = 466,021.92/781.47
  6. Step 6: Final answer
    x = 596.34

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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.