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Finding the Fourth Proportional to 141.57, 195.36 and 86.31

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Solution

The fourth proportional to 141.57, 195.36 and 86.31 is: 119.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.57 : 195.36 = 86.31 : x
  2. Step 2: Convert to fraction form
    141.57/195.36 = 86.31/x
  3. Step 3: Cross multiply
    141.57x = 195.36 × 86.31
  4. Step 4: Simplify right side
    141.57x = 16,861.52
  5. Step 5: Solve for x
    x = 16,861.52/141.57
  6. Step 6: Final answer
    x = 119.10

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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.