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Finding the Fourth Proportional to 610.57, 915.63 and 427.87

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Solution

The fourth proportional to 610.57, 915.63 and 427.87 is: 641.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.57 : 915.63 = 427.87 : x
  2. Step 2: Convert to fraction form
    610.57/915.63 = 427.87/x
  3. Step 3: Cross multiply
    610.57x = 915.63 × 427.87
  4. Step 4: Simplify right side
    610.57x = 391,770.61
  5. Step 5: Solve for x
    x = 391,770.61/610.57
  6. Step 6: Final answer
    x = 641.65

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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.