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Finding the Fourth Proportional to 610.96, 916.20 and 418.64

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Solution

The fourth proportional to 610.96, 916.20 and 418.64 is: 627.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.96 : 916.20 = 418.64 : x
  2. Step 2: Convert to fraction form
    610.96/916.20 = 418.64/x
  3. Step 3: Cross multiply
    610.96x = 916.20 × 418.64
  4. Step 4: Simplify right side
    610.96x = 383,557.97
  5. Step 5: Solve for x
    x = 383,557.97/610.96
  6. Step 6: Final answer
    x = 627.80

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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.