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Finding the Fourth Proportional to 108.87, 150.02 and 74.31

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Solution

The fourth proportional to 108.87, 150.02 and 74.31 is: 102.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.87 : 150.02 = 74.31 : x
  2. Step 2: Convert to fraction form
    108.87/150.02 = 74.31/x
  3. Step 3: Cross multiply
    108.87x = 150.02 × 74.31
  4. Step 4: Simplify right side
    108.87x = 11,147.61
  5. Step 5: Solve for x
    x = 11,147.61/108.87
  6. Step 6: Final answer
    x = 102.39

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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.