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Finding the Fourth Proportional to 168.14, 251.90 and 87.04

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Solution

The fourth proportional to 168.14, 251.90 and 87.04 is: 130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.14 : 251.90 = 87.04 : x
  2. Step 2: Convert to fraction form
    168.14/251.90 = 87.04/x
  3. Step 3: Cross multiply
    168.14x = 251.90 × 87.04
  4. Step 4: Simplify right side
    168.14x = 21,925.38
  5. Step 5: Solve for x
    x = 21,925.38/168.14
  6. Step 6: Final answer
    x = 130.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.