Home / 20,686.19-31,016.78-8,207.87

Finding the Fourth Proportional to 20,686.19, 31,016.78 and 8,207.87

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Solution

The fourth proportional to 20,686.19, 31,016.78 and 8,207.87 is: 12,306.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.19 : 31,016.78 = 8,207.87 : x
  2. Step 2: Convert to fraction form
    20,686.19/31,016.78 = 8,207.87/x
  3. Step 3: Cross multiply
    20,686.19x = 31,016.78 × 8,207.87
  4. Step 4: Simplify right side
    20,686.19x = 254,581,657.02
  5. Step 5: Solve for x
    x = 254,581,657.02/20,686.19
  6. Step 6: Final answer
    x = 12,306.84

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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.