Home / 80,310.24-120,471.28-21,145.50

Finding the Fourth Proportional to 80,310.24, 120,471.28 and 21,145.50

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Solution

The fourth proportional to 80,310.24, 120,471.28 and 21,145.50 is: 31,719.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,310.24 : 120,471.28 = 21,145.50 : x
  2. Step 2: Convert to fraction form
    80,310.24/120,471.28 = 21,145.50/x
  3. Step 3: Cross multiply
    80,310.24x = 120,471.28 × 21,145.50
  4. Step 4: Simplify right side
    80,310.24x = 2,547,425,398.38
  5. Step 5: Solve for x
    x = 2,547,425,398.38/80,310.24
  6. Step 6: Final answer
    x = 31,719.81

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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.