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Finding the Fourth Proportional to 872.20, 1,309.29 and 547.75

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Solution

The fourth proportional to 872.20, 1,309.29 and 547.75 is: 822.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.20 : 1,309.29 = 547.75 : x
  2. Step 2: Convert to fraction form
    872.20/1,309.29 = 547.75/x
  3. Step 3: Cross multiply
    872.20x = 1,309.29 × 547.75
  4. Step 4: Simplify right side
    872.20x = 717,163.60
  5. Step 5: Solve for x
    x = 717,163.60/872.20
  6. Step 6: Final answer
    x = 822.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.