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Finding the Fourth Proportional to 63.66, 94.86 and 61.72

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Solution

The fourth proportional to 63.66, 94.86 and 61.72 is: 91.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.66 : 94.86 = 61.72 : x
  2. Step 2: Convert to fraction form
    63.66/94.86 = 61.72/x
  3. Step 3: Cross multiply
    63.66x = 94.86 × 61.72
  4. Step 4: Simplify right side
    63.66x = 5,854.76
  5. Step 5: Solve for x
    x = 5,854.76/63.66
  6. Step 6: Final answer
    x = 91.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.