Home / 20,960.28-31,439.70-5,378.04

Finding the Fourth Proportional to 20,960.28, 31,439.70 and 5,378.04

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Solution

The fourth proportional to 20,960.28, 31,439.70 and 5,378.04 is: 8,066.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.28 : 31,439.70 = 5,378.04 : x
  2. Step 2: Convert to fraction form
    20,960.28/31,439.70 = 5,378.04/x
  3. Step 3: Cross multiply
    20,960.28x = 31,439.70 × 5,378.04
  4. Step 4: Simplify right side
    20,960.28x = 169,083,964.19
  5. Step 5: Solve for x
    x = 169,083,964.19/20,960.28
  6. Step 6: Final answer
    x = 8,066.88

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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.