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Finding the Fourth Proportional to 141.35, 211.68 and 89.91

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Solution

The fourth proportional to 141.35, 211.68 and 89.91 is: 134.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.35 : 211.68 = 89.91 : x
  2. Step 2: Convert to fraction form
    141.35/211.68 = 89.91/x
  3. Step 3: Cross multiply
    141.35x = 211.68 × 89.91
  4. Step 4: Simplify right side
    141.35x = 19,032.15
  5. Step 5: Solve for x
    x = 19,032.15/141.35
  6. Step 6: Final answer
    x = 134.65

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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.