Home / 21,269.79-31,909.24-6,479.90

Finding the Fourth Proportional to 21,269.79, 31,909.24 and 6,479.90

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Solution

The fourth proportional to 21,269.79, 31,909.24 and 6,479.90 is: 9,721.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,269.79 : 31,909.24 = 6,479.90 : x
  2. Step 2: Convert to fraction form
    21,269.79/31,909.24 = 6,479.90/x
  3. Step 3: Cross multiply
    21,269.79x = 31,909.24 × 6,479.90
  4. Step 4: Simplify right side
    21,269.79x = 206,768,620.70
  5. Step 5: Solve for x
    x = 206,768,620.70/21,269.79
  6. Step 6: Final answer
    x = 9,721.23

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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.