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Finding the Fourth Proportional to 767.17, 1,057.49 and 642.61

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Solution

The fourth proportional to 767.17, 1,057.49 and 642.61 is: 885.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.17 : 1,057.49 = 642.61 : x
  2. Step 2: Convert to fraction form
    767.17/1,057.49 = 642.61/x
  3. Step 3: Cross multiply
    767.17x = 1,057.49 × 642.61
  4. Step 4: Simplify right side
    767.17x = 679,553.65
  5. Step 5: Solve for x
    x = 679,553.65/767.17
  6. Step 6: Final answer
    x = 885.79

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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.