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Finding the Fourth Proportional to 872.08, 1,308.29 and 287.17

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Solution

The fourth proportional to 872.08, 1,308.29 and 287.17 is: 430.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.08 : 1,308.29 = 287.17 : x
  2. Step 2: Convert to fraction form
    872.08/1,308.29 = 287.17/x
  3. Step 3: Cross multiply
    872.08x = 1,308.29 × 287.17
  4. Step 4: Simplify right side
    872.08x = 375,696.93
  5. Step 5: Solve for x
    x = 375,696.93/872.08
  6. Step 6: Final answer
    x = 430.81

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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.