Home / 28,129.38-42,214.62-20,753.70

Finding the Fourth Proportional to 28,129.38, 42,214.62 and 20,753.70

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Solution

The fourth proportional to 28,129.38, 42,214.62 and 20,753.70 is: 31,145.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.38 : 42,214.62 = 20,753.70 : x
  2. Step 2: Convert to fraction form
    28,129.38/42,214.62 = 20,753.70/x
  3. Step 3: Cross multiply
    28,129.38x = 42,214.62 × 20,753.70
  4. Step 4: Simplify right side
    28,129.38x = 876,109,559.09
  5. Step 5: Solve for x
    x = 876,109,559.09/28,129.38
  6. Step 6: Final answer
    x = 31,145.71

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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.