Home / 31,318.68-43,221.78-20,689.68

Finding the Fourth Proportional to 31,318.68, 43,221.78 and 20,689.68

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Solution

The fourth proportional to 31,318.68, 43,221.78 and 20,689.68 is: 28,553.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,318.68 : 43,221.78 = 20,689.68 : x
  2. Step 2: Convert to fraction form
    31,318.68/43,221.78 = 20,689.68/x
  3. Step 3: Cross multiply
    31,318.68x = 43,221.78 × 20,689.68
  4. Step 4: Simplify right side
    31,318.68x = 894,244,797.23
  5. Step 5: Solve for x
    x = 894,244,797.23/31,318.68
  6. Step 6: Final answer
    x = 28,553.08

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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.