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Finding the Fourth Proportional to 782.72, 1,080 and 627.84

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Solution

The fourth proportional to 782.72, 1,080 and 627.84 is: 866.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.72 : 1,080 = 627.84 : x
  2. Step 2: Convert to fraction form
    782.72/1,080 = 627.84/x
  3. Step 3: Cross multiply
    782.72x = 1,080 × 627.84
  4. Step 4: Simplify right side
    782.72x = 678,067.20
  5. Step 5: Solve for x
    x = 678,067.20/782.72
  6. Step 6: Final answer
    x = 866.30

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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.