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Finding the Fourth Proportional to 782.90, 1,080.44 and 451.38

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Solution

The fourth proportional to 782.90, 1,080.44 and 451.38 is: 622.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.90 : 1,080.44 = 451.38 : x
  2. Step 2: Convert to fraction form
    782.90/1,080.44 = 451.38/x
  3. Step 3: Cross multiply
    782.90x = 1,080.44 × 451.38
  4. Step 4: Simplify right side
    782.90x = 487,686.75
  5. Step 5: Solve for x
    x = 487,686.75/782.90
  6. Step 6: Final answer
    x = 622.93

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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.