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Finding the Fourth Proportional to 74.72, 103.12 and 61.66

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Solution

The fourth proportional to 74.72, 103.12 and 61.66 is: 85.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.72 : 103.12 = 61.66 : x
  2. Step 2: Convert to fraction form
    74.72/103.12 = 61.66/x
  3. Step 3: Cross multiply
    74.72x = 103.12 × 61.66
  4. Step 4: Simplify right side
    74.72x = 6,358.70
  5. Step 5: Solve for x
    x = 6,358.70/74.72
  6. Step 6: Final answer
    x = 85.10

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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.