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Finding the Fourth Proportional to 49.39, 74.03 and 42.12

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Solution

The fourth proportional to 49.39, 74.03 and 42.12 is: 63.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.39 : 74.03 = 42.12 : x
  2. Step 2: Convert to fraction form
    49.39/74.03 = 42.12/x
  3. Step 3: Cross multiply
    49.39x = 74.03 × 42.12
  4. Step 4: Simplify right side
    49.39x = 3,118.17
  5. Step 5: Solve for x
    x = 3,118.17/49.39
  6. Step 6: Final answer
    x = 63.13

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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.