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Finding the Fourth Proportional to 782.60, 1,079.46 and 699.56

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Solution

The fourth proportional to 782.60, 1,079.46 and 699.56 is: 964.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.60 : 1,079.46 = 699.56 : x
  2. Step 2: Convert to fraction form
    782.60/1,079.46 = 699.56/x
  3. Step 3: Cross multiply
    782.60x = 1,079.46 × 699.56
  4. Step 4: Simplify right side
    782.60x = 755,147.04
  5. Step 5: Solve for x
    x = 755,147.04/782.60
  6. Step 6: Final answer
    x = 964.92

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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.