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Finding the Fourth Proportional to 610.68, 915.72 and 220.66

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Solution

The fourth proportional to 610.68, 915.72 and 220.66 is: 330.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.68 : 915.72 = 220.66 : x
  2. Step 2: Convert to fraction form
    610.68/915.72 = 220.66/x
  3. Step 3: Cross multiply
    610.68x = 915.72 × 220.66
  4. Step 4: Simplify right side
    610.68x = 202,062.78
  5. Step 5: Solve for x
    x = 202,062.78/610.68
  6. Step 6: Final answer
    x = 330.88

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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.