Home / 20,761.70-31,142.55-18,515.30

Finding the Fourth Proportional to 20,761.70, 31,142.55 and 18,515.30

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Solution

The fourth proportional to 20,761.70, 31,142.55 and 18,515.30 is: 27,772.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.70 : 31,142.55 = 18,515.30 : x
  2. Step 2: Convert to fraction form
    20,761.70/31,142.55 = 18,515.30/x
  3. Step 3: Cross multiply
    20,761.70x = 31,142.55 × 18,515.30
  4. Step 4: Simplify right side
    20,761.70x = 576,613,656.02
  5. Step 5: Solve for x
    x = 576,613,656.02/20,761.70
  6. Step 6: Final answer
    x = 27,772.95

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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.