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Finding the Fourth Proportional to 610.71, 915.84 and 220.61

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Solution

The fourth proportional to 610.71, 915.84 and 220.61 is: 330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.71 : 915.84 = 220.61 : x
  2. Step 2: Convert to fraction form
    610.71/915.84 = 220.61/x
  3. Step 3: Cross multiply
    610.71x = 915.84 × 220.61
  4. Step 4: Simplify right side
    610.71x = 202,043.46
  5. Step 5: Solve for x
    x = 202,043.46/610.71
  6. Step 6: Final answer
    x = 330.83

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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.