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Finding the Fourth Proportional to 685.11, 1,025.13 and 502.86

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Solution

The fourth proportional to 685.11, 1,025.13 and 502.86 is: 752.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.11 : 1,025.13 = 502.86 : x
  2. Step 2: Convert to fraction form
    685.11/1,025.13 = 502.86/x
  3. Step 3: Cross multiply
    685.11x = 1,025.13 × 502.86
  4. Step 4: Simplify right side
    685.11x = 515,496.87
  5. Step 5: Solve for x
    x = 515,496.87/685.11
  6. Step 6: Final answer
    x = 752.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.