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Finding the Fourth Proportional to 872.16, 1,308.24 and 287.22

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Solution

The fourth proportional to 872.16, 1,308.24 and 287.22 is: 430.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.16 : 1,308.24 = 287.22 : x
  2. Step 2: Convert to fraction form
    872.16/1,308.24 = 287.22/x
  3. Step 3: Cross multiply
    872.16x = 1,308.24 × 287.22
  4. Step 4: Simplify right side
    872.16x = 375,752.69
  5. Step 5: Solve for x
    x = 375,752.69/872.16
  6. Step 6: Final answer
    x = 430.83

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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.