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Finding the Fourth Proportional to 782.71, 1,080.12 and 451.20

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Solution

The fourth proportional to 782.71, 1,080.12 and 451.20 is: 622.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.71 : 1,080.12 = 451.20 : x
  2. Step 2: Convert to fraction form
    782.71/1,080.12 = 451.20/x
  3. Step 3: Cross multiply
    782.71x = 1,080.12 × 451.20
  4. Step 4: Simplify right side
    782.71x = 487,350.14
  5. Step 5: Solve for x
    x = 487,350.14/782.71
  6. Step 6: Final answer
    x = 622.64

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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.