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Finding the Fourth Proportional to 126.91, 175.12 and 71.65

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Solution

The fourth proportional to 126.91, 175.12 and 71.65 is: 98.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.91 : 175.12 = 71.65 : x
  2. Step 2: Convert to fraction form
    126.91/175.12 = 71.65/x
  3. Step 3: Cross multiply
    126.91x = 175.12 × 71.65
  4. Step 4: Simplify right side
    126.91x = 12,547.35
  5. Step 5: Solve for x
    x = 12,547.35/126.91
  6. Step 6: Final answer
    x = 98.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.