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Finding the Fourth Proportional to 715.63, 1,073.45 and 680.65

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Solution

The fourth proportional to 715.63, 1,073.45 and 680.65 is: 1,020.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.63 : 1,073.45 = 680.65 : x
  2. Step 2: Convert to fraction form
    715.63/1,073.45 = 680.65/x
  3. Step 3: Cross multiply
    715.63x = 1,073.45 × 680.65
  4. Step 4: Simplify right side
    715.63x = 730,634.97
  5. Step 5: Solve for x
    x = 730,634.97/715.63
  6. Step 6: Final answer
    x = 1,020.97

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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.