Home / 31,217.25-43,115.30-20,990.49

Finding the Fourth Proportional to 31,217.25, 43,115.30 and 20,990.49

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Solution

The fourth proportional to 31,217.25, 43,115.30 and 20,990.49 is: 28,990.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,217.25 : 43,115.30 = 20,990.49 : x
  2. Step 2: Convert to fraction form
    31,217.25/43,115.30 = 20,990.49/x
  3. Step 3: Cross multiply
    31,217.25x = 43,115.30 × 20,990.49
  4. Step 4: Simplify right side
    31,217.25x = 905,011,168.54
  5. Step 5: Solve for x
    x = 905,011,168.54/31,217.25
  6. Step 6: Final answer
    x = 28,990.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.