Home / 20,991.27-31,486.40-8,507.96

Finding the Fourth Proportional to 20,991.27, 31,486.40 and 8,507.96

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Solution

The fourth proportional to 20,991.27, 31,486.40 and 8,507.96 is: 12,761.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.27 : 31,486.40 = 8,507.96 : x
  2. Step 2: Convert to fraction form
    20,991.27/31,486.40 = 8,507.96/x
  3. Step 3: Cross multiply
    20,991.27x = 31,486.40 × 8,507.96
  4. Step 4: Simplify right side
    20,991.27x = 267,885,031.74
  5. Step 5: Solve for x
    x = 267,885,031.74/20,991.27
  6. Step 6: Final answer
    x = 12,761.74

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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.