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Finding the Fourth Proportional to 140.81, 211.08 and 68.59

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Solution

The fourth proportional to 140.81, 211.08 and 68.59 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.81 : 211.08 = 68.59 : x
  2. Step 2: Convert to fraction form
    140.81/211.08 = 68.59/x
  3. Step 3: Cross multiply
    140.81x = 211.08 × 68.59
  4. Step 4: Simplify right side
    140.81x = 14,476.92
  5. Step 5: Solve for x
    x = 14,476.92/140.81
  6. Step 6: Final answer
    x = 102.81

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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.