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Finding the Fourth Proportional to 748.65, 1,121.69 and 672.57

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Solution

The fourth proportional to 748.65, 1,121.69 and 672.57 is: 1,007.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.65 : 1,121.69 = 672.57 : x
  2. Step 2: Convert to fraction form
    748.65/1,121.69 = 672.57/x
  3. Step 3: Cross multiply
    748.65x = 1,121.69 × 672.57
  4. Step 4: Simplify right side
    748.65x = 754,416.72
  5. Step 5: Solve for x
    x = 754,416.72/748.65
  6. Step 6: Final answer
    x = 1,007.70

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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.