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Finding the Fourth Proportional to 1,251.72, 1,726.98 and 879

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Solution

The fourth proportional to 1,251.72, 1,726.98 and 879 is: 1,212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.72 : 1,726.98 = 879 : x
  2. Step 2: Convert to fraction form
    1,251.72/1,726.98 = 879/x
  3. Step 3: Cross multiply
    1,251.72x = 1,726.98 × 879
  4. Step 4: Simplify right side
    1,251.72x = 1,518,015.42
  5. Step 5: Solve for x
    x = 1,518,015.42/1,251.72
  6. Step 6: Final answer
    x = 1,212.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.