Home / 20,679.11-31,018.18-6,638.57

Finding the Fourth Proportional to 20,679.11, 31,018.18 and 6,638.57

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Solution

The fourth proportional to 20,679.11, 31,018.18 and 6,638.57 is: 9,957.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.11 : 31,018.18 = 6,638.57 : x
  2. Step 2: Convert to fraction form
    20,679.11/31,018.18 = 6,638.57/x
  3. Step 3: Cross multiply
    20,679.11x = 31,018.18 × 6,638.57
  4. Step 4: Simplify right side
    20,679.11x = 205,916,359.20
  5. Step 5: Solve for x
    x = 205,916,359.20/20,679.11
  6. Step 6: Final answer
    x = 9,957.70

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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.