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Finding the Fourth Proportional to 149.96, 206.95 and 87.78

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Solution

The fourth proportional to 149.96, 206.95 and 87.78 is: 121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.96 : 206.95 = 87.78 : x
  2. Step 2: Convert to fraction form
    149.96/206.95 = 87.78/x
  3. Step 3: Cross multiply
    149.96x = 206.95 × 87.78
  4. Step 4: Simplify right side
    149.96x = 18,166.07
  5. Step 5: Solve for x
    x = 18,166.07/149.96
  6. Step 6: Final answer
    x = 121.14

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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.