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Finding the Fourth Proportional to 49.87, 74.54 and 42.69

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Solution

The fourth proportional to 49.87, 74.54 and 42.69 is: 63.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.87 : 74.54 = 42.69 : x
  2. Step 2: Convert to fraction form
    49.87/74.54 = 42.69/x
  3. Step 3: Cross multiply
    49.87x = 74.54 × 42.69
  4. Step 4: Simplify right side
    49.87x = 3,182.26
  5. Step 5: Solve for x
    x = 3,182.26/49.87
  6. Step 6: Final answer
    x = 63.82

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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.