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Finding the Fourth Proportional to 74.87, 103.31 and 42.13

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Solution

The fourth proportional to 74.87, 103.31 and 42.13 is: 58.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.87 : 103.31 = 42.13 : x
  2. Step 2: Convert to fraction form
    74.87/103.31 = 42.13/x
  3. Step 3: Cross multiply
    74.87x = 103.31 × 42.13
  4. Step 4: Simplify right side
    74.87x = 4,352.24
  5. Step 5: Solve for x
    x = 4,352.24/74.87
  6. Step 6: Final answer
    x = 58.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.