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Finding the Fourth Proportional to 782.72, 1,079.89 and 451.03

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Solution

The fourth proportional to 782.72, 1,079.89 and 451.03 is: 622.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.72 : 1,079.89 = 451.03 : x
  2. Step 2: Convert to fraction form
    782.72/1,079.89 = 451.03/x
  3. Step 3: Cross multiply
    782.72x = 1,079.89 × 451.03
  4. Step 4: Simplify right side
    782.72x = 487,062.79
  5. Step 5: Solve for x
    x = 487,062.79/782.72
  6. Step 6: Final answer
    x = 622.27

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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.