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Finding the Fourth Proportional to 2,879.76, 4,319.64 and 931.97

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Solution

The fourth proportional to 2,879.76, 4,319.64 and 931.97 is: 1,397.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,879.76 : 4,319.64 = 931.97 : x
  2. Step 2: Convert to fraction form
    2,879.76/4,319.64 = 931.97/x
  3. Step 3: Cross multiply
    2,879.76x = 4,319.64 × 931.97
  4. Step 4: Simplify right side
    2,879.76x = 4,025,753.29
  5. Step 5: Solve for x
    x = 4,025,753.29/2,879.76
  6. Step 6: Final answer
    x = 1,397.95

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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.