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Finding the Fourth Proportional to 782.74, 1,080.12 and 451.18

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Solution

The fourth proportional to 782.74, 1,080.12 and 451.18 is: 622.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.74 : 1,080.12 = 451.18 : x
  2. Step 2: Convert to fraction form
    782.74/1,080.12 = 451.18/x
  3. Step 3: Cross multiply
    782.74x = 1,080.12 × 451.18
  4. Step 4: Simplify right side
    782.74x = 487,323.14
  5. Step 5: Solve for x
    x = 487,323.14/782.74
  6. Step 6: Final answer
    x = 622.59

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1.5x scale

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.