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Finding the Fourth Proportional to 61.85, 92.72 and 42.56

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Solution

The fourth proportional to 61.85, 92.72 and 42.56 is: 63.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.85 : 92.72 = 42.56 : x
  2. Step 2: Convert to fraction form
    61.85/92.72 = 42.56/x
  3. Step 3: Cross multiply
    61.85x = 92.72 × 42.56
  4. Step 4: Simplify right side
    61.85x = 3,946.15
  5. Step 5: Solve for x
    x = 3,946.15/61.85
  6. Step 6: Final answer
    x = 63.80

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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.