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Finding the Fourth Proportional to 74.20, 111.54 and 42.28

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Solution

The fourth proportional to 74.20, 111.54 and 42.28 is: 63.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.20 : 111.54 = 42.28 : x
  2. Step 2: Convert to fraction form
    74.20/111.54 = 42.28/x
  3. Step 3: Cross multiply
    74.20x = 111.54 × 42.28
  4. Step 4: Simplify right side
    74.20x = 4,715.91
  5. Step 5: Solve for x
    x = 4,715.91/74.20
  6. Step 6: Final answer
    x = 63.56

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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.