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Finding the Fourth Proportional to 872.38, 1,309.35 and 579.07

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Solution

The fourth proportional to 872.38, 1,309.35 and 579.07 is: 869.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.38 : 1,309.35 = 579.07 : x
  2. Step 2: Convert to fraction form
    872.38/1,309.35 = 579.07/x
  3. Step 3: Cross multiply
    872.38x = 1,309.35 × 579.07
  4. Step 4: Simplify right side
    872.38x = 758,205.30
  5. Step 5: Solve for x
    x = 758,205.30/872.38
  6. Step 6: Final answer
    x = 869.12

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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.