Home / 21,315.98-31,974.08-5,519.90

Finding the Fourth Proportional to 21,315.98, 31,974.08 and 5,519.90

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Solution

The fourth proportional to 21,315.98, 31,974.08 and 5,519.90 is: 8,279.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.98 : 31,974.08 = 5,519.90 : x
  2. Step 2: Convert to fraction form
    21,315.98/31,974.08 = 5,519.90/x
  3. Step 3: Cross multiply
    21,315.98x = 31,974.08 × 5,519.90
  4. Step 4: Simplify right side
    21,315.98x = 176,493,724.19
  5. Step 5: Solve for x
    x = 176,493,724.19/21,315.98
  6. Step 6: Final answer
    x = 8,279.88

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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.