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Finding the Fourth Proportional to 49.61, 74.08 and 42.80

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Solution

The fourth proportional to 49.61, 74.08 and 42.80 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.61 : 74.08 = 42.80 : x
  2. Step 2: Convert to fraction form
    49.61/74.08 = 42.80/x
  3. Step 3: Cross multiply
    49.61x = 74.08 × 42.80
  4. Step 4: Simplify right side
    49.61x = 3,170.31
  5. Step 5: Solve for x
    x = 3,170.31/49.61
  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.