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Finding the Fourth Proportional to 782.45, 1,079.78 and 450.86

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Solution

The fourth proportional to 782.45, 1,079.78 and 450.86 is: 622.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.45 : 1,079.78 = 450.86 : x
  2. Step 2: Convert to fraction form
    782.45/1,079.78 = 450.86/x
  3. Step 3: Cross multiply
    782.45x = 1,079.78 × 450.86
  4. Step 4: Simplify right side
    782.45x = 486,821.96
  5. Step 5: Solve for x
    x = 486,821.96/782.45
  6. Step 6: Final answer
    x = 622.18

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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.