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Finding the Fourth Proportional to 782.29, 1,079.80 and 450.95

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Solution

The fourth proportional to 782.29, 1,079.80 and 450.95 is: 622.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.29 : 1,079.80 = 450.95 : x
  2. Step 2: Convert to fraction form
    782.29/1,079.80 = 450.95/x
  3. Step 3: Cross multiply
    782.29x = 1,079.80 × 450.95
  4. Step 4: Simplify right side
    782.29x = 486,933.56
  5. Step 5: Solve for x
    x = 486,933.56/782.29
  6. Step 6: Final answer
    x = 622.45

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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.