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Finding the Fourth Proportional to 782.35, 1,079.48 and 450.69

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Solution

The fourth proportional to 782.35, 1,079.48 and 450.69 is: 621.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.35 : 1,079.48 = 450.69 : x
  2. Step 2: Convert to fraction form
    782.35/1,079.48 = 450.69/x
  3. Step 3: Cross multiply
    782.35x = 1,079.48 × 450.69
  4. Step 4: Simplify right side
    782.35x = 486,511.97
  5. Step 5: Solve for x
    x = 486,511.97/782.35
  6. Step 6: Final answer
    x = 621.86

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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.