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Finding the Fourth Proportional to 782.87, 1,081.34 and 689.91

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Solution

The fourth proportional to 782.87, 1,081.34 and 689.91 is: 952.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.87 : 1,081.34 = 689.91 : x
  2. Step 2: Convert to fraction form
    782.87/1,081.34 = 689.91/x
  3. Step 3: Cross multiply
    782.87x = 1,081.34 × 689.91
  4. Step 4: Simplify right side
    782.87x = 746,023.83
  5. Step 5: Solve for x
    x = 746,023.83/782.87
  6. Step 6: Final answer
    x = 952.94

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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.