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Finding the Fourth Proportional to 782.92, 1,080.66 and 627.88

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Solution

The fourth proportional to 782.92, 1,080.66 and 627.88 is: 866.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.92 : 1,080.66 = 627.88 : x
  2. Step 2: Convert to fraction form
    782.92/1,080.66 = 627.88/x
  3. Step 3: Cross multiply
    782.92x = 1,080.66 × 627.88
  4. Step 4: Simplify right side
    782.92x = 678,524.80
  5. Step 5: Solve for x
    x = 678,524.80/782.92
  6. Step 6: Final answer
    x = 866.66

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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.