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Finding the Fourth Proportional to 74.40, 111.61 and 43.92

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Solution

The fourth proportional to 74.40, 111.61 and 43.92 is: 65.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.40 : 111.61 = 43.92 : x
  2. Step 2: Convert to fraction form
    74.40/111.61 = 43.92/x
  3. Step 3: Cross multiply
    74.40x = 111.61 × 43.92
  4. Step 4: Simplify right side
    74.40x = 4,901.91
  5. Step 5: Solve for x
    x = 4,901.91/74.40
  6. Step 6: Final answer
    x = 65.89

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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.