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Finding the Fourth Proportional to 3,476.91, 5,215.40 and 879.85

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Solution

The fourth proportional to 3,476.91, 5,215.40 and 879.85 is: 1,319.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,476.91 : 5,215.40 = 879.85 : x
  2. Step 2: Convert to fraction form
    3,476.91/5,215.40 = 879.85/x
  3. Step 3: Cross multiply
    3,476.91x = 5,215.40 × 879.85
  4. Step 4: Simplify right side
    3,476.91x = 4,588,769.69
  5. Step 5: Solve for x
    x = 4,588,769.69/3,476.91
  6. Step 6: Final answer
    x = 1,319.78

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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.