Home / 20,642.70-28,422.18-18,217.56

Finding the Fourth Proportional to 20,642.70, 28,422.18 and 18,217.56

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Solution

The fourth proportional to 20,642.70, 28,422.18 and 18,217.56 is: 25,083.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.70 : 28,422.18 = 18,217.56 : x
  2. Step 2: Convert to fraction form
    20,642.70/28,422.18 = 18,217.56/x
  3. Step 3: Cross multiply
    20,642.70x = 28,422.18 × 18,217.56
  4. Step 4: Simplify right side
    20,642.70x = 517,782,769.48
  5. Step 5: Solve for x
    x = 517,782,769.48/20,642.70
  6. Step 6: Final answer
    x = 25,083.09

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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.