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Finding the Fourth Proportional to 782.70, 1,080.21 and 451.11

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Solution

The fourth proportional to 782.70, 1,080.21 and 451.11 is: 622.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.70 : 1,080.21 = 451.11 : x
  2. Step 2: Convert to fraction form
    782.70/1,080.21 = 451.11/x
  3. Step 3: Cross multiply
    782.70x = 1,080.21 × 451.11
  4. Step 4: Simplify right side
    782.70x = 487,293.53
  5. Step 5: Solve for x
    x = 487,293.53/782.70
  6. Step 6: Final answer
    x = 622.58

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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.