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Finding the Fourth Proportional to 49.69, 74.17 and 42.81

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Solution

The fourth proportional to 49.69, 74.17 and 42.81 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.69 : 74.17 = 42.81 : x
  2. Step 2: Convert to fraction form
    49.69/74.17 = 42.81/x
  3. Step 3: Cross multiply
    49.69x = 74.17 × 42.81
  4. Step 4: Simplify right side
    49.69x = 3,175.22
  5. Step 5: Solve for x
    x = 3,175.22/49.69
  6. Step 6: Final answer
    x = 63.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.