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Finding the Fourth Proportional to 831.61, 1,247.85 and 502.61

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Solution

The fourth proportional to 831.61, 1,247.85 and 502.61 is: 754.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.61 : 1,247.85 = 502.61 : x
  2. Step 2: Convert to fraction form
    831.61/1,247.85 = 502.61/x
  3. Step 3: Cross multiply
    831.61x = 1,247.85 × 502.61
  4. Step 4: Simplify right side
    831.61x = 627,185.01
  5. Step 5: Solve for x
    x = 627,185.01/831.61
  6. Step 6: Final answer
    x = 754.18

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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.