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Finding the Fourth Proportional to 931.38, 1,398 and 411.61

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Solution

The fourth proportional to 931.38, 1,398 and 411.61 is: 617.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.38 : 1,398 = 411.61 : x
  2. Step 2: Convert to fraction form
    931.38/1,398 = 411.61/x
  3. Step 3: Cross multiply
    931.38x = 1,398 × 411.61
  4. Step 4: Simplify right side
    931.38x = 575,430.78
  5. Step 5: Solve for x
    x = 575,430.78/931.38
  6. Step 6: Final answer
    x = 617.83

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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.