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Finding the Fourth Proportional to 126.65, 189.88 and 72.47

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Solution

The fourth proportional to 126.65, 189.88 and 72.47 is: 108.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.65 : 189.88 = 72.47 : x
  2. Step 2: Convert to fraction form
    126.65/189.88 = 72.47/x
  3. Step 3: Cross multiply
    126.65x = 189.88 × 72.47
  4. Step 4: Simplify right side
    126.65x = 13,760.90
  5. Step 5: Solve for x
    x = 13,760.90/126.65
  6. Step 6: Final answer
    x = 108.65

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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.