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Finding the Fourth Proportional to 141.75, 212.42 and 86.90

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Solution

The fourth proportional to 141.75, 212.42 and 86.90 is: 130.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.75 : 212.42 = 86.90 : x
  2. Step 2: Convert to fraction form
    141.75/212.42 = 86.90/x
  3. Step 3: Cross multiply
    141.75x = 212.42 × 86.90
  4. Step 4: Simplify right side
    141.75x = 18,458.45
  5. Step 5: Solve for x
    x = 18,458.45/141.75
  6. Step 6: Final answer
    x = 130.22

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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.