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Finding the Fourth Proportional to 141.80, 195.62 and 86.49

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Solution

The fourth proportional to 141.80, 195.62 and 86.49 is: 119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.80 : 195.62 = 86.49 : x
  2. Step 2: Convert to fraction form
    141.80/195.62 = 86.49/x
  3. Step 3: Cross multiply
    141.80x = 195.62 × 86.49
  4. Step 4: Simplify right side
    141.80x = 16,918.74
  5. Step 5: Solve for x
    x = 16,918.74/141.80
  6. Step 6: Final answer
    x = 119.32

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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.