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Finding the Fourth Proportional to 141.68, 211.36 and 137.76

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Solution

The fourth proportional to 141.68, 211.36 and 137.76 is: 205.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.68 : 211.36 = 137.76 : x
  2. Step 2: Convert to fraction form
    141.68/211.36 = 137.76/x
  3. Step 3: Cross multiply
    141.68x = 211.36 × 137.76
  4. Step 4: Simplify right side
    141.68x = 29,116.95
  5. Step 5: Solve for x
    x = 29,116.95/141.68
  6. Step 6: Final answer
    x = 205.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.