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Finding the Fourth Proportional to 141.35, 211.96 and 45.15

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Solution

The fourth proportional to 141.35, 211.96 and 45.15 is: 67.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.35 : 211.96 = 45.15 : x
  2. Step 2: Convert to fraction form
    141.35/211.96 = 45.15/x
  3. Step 3: Cross multiply
    141.35x = 211.96 × 45.15
  4. Step 4: Simplify right side
    141.35x = 9,569.77
  5. Step 5: Solve for x
    x = 9,569.77/141.35
  6. Step 6: Final answer
    x = 67.70

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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.