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Finding the Fourth Proportional to 610.60, 915.90 and 285.74

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Solution

The fourth proportional to 610.60, 915.90 and 285.74 is: 428.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.60 : 915.90 = 285.74 : x
  2. Step 2: Convert to fraction form
    610.60/915.90 = 285.74/x
  3. Step 3: Cross multiply
    610.60x = 915.90 × 285.74
  4. Step 4: Simplify right side
    610.60x = 261,709.27
  5. Step 5: Solve for x
    x = 261,709.27/610.60
  6. Step 6: Final answer
    x = 428.61

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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.