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Finding the Fourth Proportional to 49.72, 74.66 and 42.88

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Solution

The fourth proportional to 49.72, 74.66 and 42.88 is: 64.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.72 : 74.66 = 42.88 : x
  2. Step 2: Convert to fraction form
    49.72/74.66 = 42.88/x
  3. Step 3: Cross multiply
    49.72x = 74.66 × 42.88
  4. Step 4: Simplify right side
    49.72x = 3,201.42
  5. Step 5: Solve for x
    x = 3,201.42/49.72
  6. Step 6: Final answer
    x = 64.39

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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.