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Finding the Fourth Proportional to 872.55, 1,309.25 and 433.85

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Solution

The fourth proportional to 872.55, 1,309.25 and 433.85 is: 650.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.55 : 1,309.25 = 433.85 : x
  2. Step 2: Convert to fraction form
    872.55/1,309.25 = 433.85/x
  3. Step 3: Cross multiply
    872.55x = 1,309.25 × 433.85
  4. Step 4: Simplify right side
    872.55x = 568,009.40
  5. Step 5: Solve for x
    x = 568,009.40/872.55
  6. Step 6: Final answer
    x = 650.98

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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.