Home / 21,279.80-31,920.92-6,489.20

Finding the Fourth Proportional to 21,279.80, 31,920.92 and 6,489.20

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Solution

The fourth proportional to 21,279.80, 31,920.92 and 6,489.20 is: 9,734.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.80 : 31,920.92 = 6,489.20 : x
  2. Step 2: Convert to fraction form
    21,279.80/31,920.92 = 6,489.20/x
  3. Step 3: Cross multiply
    21,279.80x = 31,920.92 × 6,489.20
  4. Step 4: Simplify right side
    21,279.80x = 207,141,234.06
  5. Step 5: Solve for x
    x = 207,141,234.06/21,279.80
  6. Step 6: Final answer
    x = 9,734.17

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1.5x scale

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.