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Finding the Fourth Proportional to 140.69, 211.28 and 115.06

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Solution

The fourth proportional to 140.69, 211.28 and 115.06 is: 172.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.69 : 211.28 = 115.06 : x
  2. Step 2: Convert to fraction form
    140.69/211.28 = 115.06/x
  3. Step 3: Cross multiply
    140.69x = 211.28 × 115.06
  4. Step 4: Simplify right side
    140.69x = 24,309.84
  5. Step 5: Solve for x
    x = 24,309.84/140.69
  6. Step 6: Final answer
    x = 172.79

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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.