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Finding the Fourth Proportional to 610.57, 915.73 and 215.31

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Solution

The fourth proportional to 610.57, 915.73 and 215.31 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.57 : 915.73 = 215.31 : x
  2. Step 2: Convert to fraction form
    610.57/915.73 = 215.31/x
  3. Step 3: Cross multiply
    610.57x = 915.73 × 215.31
  4. Step 4: Simplify right side
    610.57x = 197,160.17
  5. Step 5: Solve for x
    x = 197,160.17/610.57
  6. Step 6: Final answer
    x = 322.91

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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.