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Finding the Fourth Proportional to 610.92, 915.75 and 391.71

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Solution

The fourth proportional to 610.92, 915.75 and 391.71 is: 587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.92 : 915.75 = 391.71 : x
  2. Step 2: Convert to fraction form
    610.92/915.75 = 391.71/x
  3. Step 3: Cross multiply
    610.92x = 915.75 × 391.71
  4. Step 4: Simplify right side
    610.92x = 358,708.43
  5. Step 5: Solve for x
    x = 358,708.43/610.92
  6. Step 6: Final answer
    x = 587.16

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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.