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Finding the Fourth Proportional to 872.24, 1,308.83 and 865.17

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Solution

The fourth proportional to 872.24, 1,308.83 and 865.17 is: 1,298.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.24 : 1,308.83 = 865.17 : x
  2. Step 2: Convert to fraction form
    872.24/1,308.83 = 865.17/x
  3. Step 3: Cross multiply
    872.24x = 1,308.83 × 865.17
  4. Step 4: Simplify right side
    872.24x = 1,132,356.13
  5. Step 5: Solve for x
    x = 1,132,356.13/872.24
  6. Step 6: Final answer
    x = 1,298.22

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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.