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Finding the Fourth Proportional to 74.61, 111.89 and 66.39

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Solution

The fourth proportional to 74.61, 111.89 and 66.39 is: 99.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.61 : 111.89 = 66.39 : x
  2. Step 2: Convert to fraction form
    74.61/111.89 = 66.39/x
  3. Step 3: Cross multiply
    74.61x = 111.89 × 66.39
  4. Step 4: Simplify right side
    74.61x = 7,428.05
  5. Step 5: Solve for x
    x = 7,428.05/74.61
  6. Step 6: Final answer
    x = 99.56

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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.