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Finding the Fourth Proportional to 872.60, 1,305.66 and 862.88

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Solution

The fourth proportional to 872.60, 1,305.66 and 862.88 is: 1,291.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.60 : 1,305.66 = 862.88 : x
  2. Step 2: Convert to fraction form
    872.60/1,305.66 = 862.88/x
  3. Step 3: Cross multiply
    872.60x = 1,305.66 × 862.88
  4. Step 4: Simplify right side
    872.60x = 1,126,627.90
  5. Step 5: Solve for x
    x = 1,126,627.90/872.60
  6. Step 6: Final answer
    x = 1,291.12

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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.