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Finding the Fourth Proportional to 141.20, 211.79 and 49.89

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Solution

The fourth proportional to 141.20, 211.79 and 49.89 is: 74.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.20 : 211.79 = 49.89 : x
  2. Step 2: Convert to fraction form
    141.20/211.79 = 49.89/x
  3. Step 3: Cross multiply
    141.20x = 211.79 × 49.89
  4. Step 4: Simplify right side
    141.20x = 10,565.14
  5. Step 5: Solve for x
    x = 10,565.14/141.20
  6. Step 6: Final answer
    x = 74.82

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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.