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Finding the Fourth Proportional to 1,115.27, 1,672.90 and 872

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Solution

The fourth proportional to 1,115.27, 1,672.90 and 872 is: 1,307.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.27 : 1,672.90 = 872 : x
  2. Step 2: Convert to fraction form
    1,115.27/1,672.90 = 872/x
  3. Step 3: Cross multiply
    1,115.27x = 1,672.90 × 872
  4. Step 4: Simplify right side
    1,115.27x = 1,458,766.62
  5. Step 5: Solve for x
    x = 1,458,766.62/1,115.27
  6. Step 6: Final answer
    x = 1,307.99

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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.