Home / 10,490.40-15,721.70-3,909.96

Finding the Fourth Proportional to 10,490.40, 15,721.70 and 3,909.96

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Solution

The fourth proportional to 10,490.40, 15,721.70 and 3,909.96 is: 5,859.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,490.40 : 15,721.70 = 3,909.96 : x
  2. Step 2: Convert to fraction form
    10,490.40/15,721.70 = 3,909.96/x
  3. Step 3: Cross multiply
    10,490.40x = 15,721.70 × 3,909.96
  4. Step 4: Simplify right side
    10,490.40x = 61,471,198.58
  5. Step 5: Solve for x
    x = 61,471,198.58/10,490.40
  6. Step 6: Final answer
    x = 5,859.76

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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.