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Finding the Fourth Proportional to 74.78, 112.72 and 66.95

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Solution

The fourth proportional to 74.78, 112.72 and 66.95 is: 100.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.78 : 112.72 = 66.95 : x
  2. Step 2: Convert to fraction form
    74.78/112.72 = 66.95/x
  3. Step 3: Cross multiply
    74.78x = 112.72 × 66.95
  4. Step 4: Simplify right side
    74.78x = 7,545.87
  5. Step 5: Solve for x
    x = 7,545.87/74.78
  6. Step 6: Final answer
    x = 100.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.