Home / 20,761.40-31,280.80-18,789.68

Finding the Fourth Proportional to 20,761.40, 31,280.80 and 18,789.68

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Solution

The fourth proportional to 20,761.40, 31,280.80 and 18,789.68 is: 28,310.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.40 : 31,280.80 = 18,789.68 : x
  2. Step 2: Convert to fraction form
    20,761.40/31,280.80 = 18,789.68/x
  3. Step 3: Cross multiply
    20,761.40x = 31,280.80 × 18,789.68
  4. Step 4: Simplify right side
    20,761.40x = 587,756,222.14
  5. Step 5: Solve for x
    x = 587,756,222.14/20,761.40
  6. Step 6: Final answer
    x = 28,310.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.