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Finding the Fourth Proportional to 807.56, 1,115.74 and 610.72

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Solution

The fourth proportional to 807.56, 1,115.74 and 610.72 is: 843.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.56 : 1,115.74 = 610.72 : x
  2. Step 2: Convert to fraction form
    807.56/1,115.74 = 610.72/x
  3. Step 3: Cross multiply
    807.56x = 1,115.74 × 610.72
  4. Step 4: Simplify right side
    807.56x = 681,404.73
  5. Step 5: Solve for x
    x = 681,404.73/807.56
  6. Step 6: Final answer
    x = 843.78

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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.