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Finding the Fourth Proportional to 149.47, 206.27 and 87.31

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Solution

The fourth proportional to 149.47, 206.27 and 87.31 is: 120.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.47 : 206.27 = 87.31 : x
  2. Step 2: Convert to fraction form
    149.47/206.27 = 87.31/x
  3. Step 3: Cross multiply
    149.47x = 206.27 × 87.31
  4. Step 4: Simplify right side
    149.47x = 18,007.97
  5. Step 5: Solve for x
    x = 18,007.97/149.47
  6. Step 6: Final answer
    x = 120.48

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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.