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Finding the Fourth Proportional to 141.20, 211.87 and 64.15

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Solution

The fourth proportional to 141.20, 211.87 and 64.15 is: 96.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.20 : 211.87 = 64.15 : x
  2. Step 2: Convert to fraction form
    141.20/211.87 = 64.15/x
  3. Step 3: Cross multiply
    141.20x = 211.87 × 64.15
  4. Step 4: Simplify right side
    141.20x = 13,591.01
  5. Step 5: Solve for x
    x = 13,591.01/141.20
  6. Step 6: Final answer
    x = 96.25

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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.