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Finding the Fourth Proportional to 782.38, 1,079.56 and 467.61

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Solution

The fourth proportional to 782.38, 1,079.56 and 467.61 is: 645.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.38 : 1,079.56 = 467.61 : x
  2. Step 2: Convert to fraction form
    782.38/1,079.56 = 467.61/x
  3. Step 3: Cross multiply
    782.38x = 1,079.56 × 467.61
  4. Step 4: Simplify right side
    782.38x = 504,813.05
  5. Step 5: Solve for x
    x = 504,813.05/782.38
  6. Step 6: Final answer
    x = 645.23

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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.