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Finding the Fourth Proportional to 61.75, 85.25 and 47.91

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Solution

The fourth proportional to 61.75, 85.25 and 47.91 is: 66.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.75 : 85.25 = 47.91 : x
  2. Step 2: Convert to fraction form
    61.75/85.25 = 47.91/x
  3. Step 3: Cross multiply
    61.75x = 85.25 × 47.91
  4. Step 4: Simplify right side
    61.75x = 4,084.29
  5. Step 5: Solve for x
    x = 4,084.29/61.75
  6. Step 6: Final answer
    x = 66.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.