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Finding the Fourth Proportional to 149.90, 206.87 and 87.74

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Solution

The fourth proportional to 149.90, 206.87 and 87.74 is: 121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.90 : 206.87 = 87.74 : x
  2. Step 2: Convert to fraction form
    149.90/206.87 = 87.74/x
  3. Step 3: Cross multiply
    149.90x = 206.87 × 87.74
  4. Step 4: Simplify right side
    149.90x = 18,149.83
  5. Step 5: Solve for x
    x = 18,149.83/149.90
  6. Step 6: Final answer
    x = 121.08

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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.