Home / 20,769.12-31,158-9,079.20

Finding the Fourth Proportional to 20,769.12, 31,158 and 9,079.20

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Solution

The fourth proportional to 20,769.12, 31,158 and 9,079.20 is: 13,620.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,769.12 : 31,158 = 9,079.20 : x
  2. Step 2: Convert to fraction form
    20,769.12/31,158 = 9,079.20/x
  3. Step 3: Cross multiply
    20,769.12x = 31,158 × 9,079.20
  4. Step 4: Simplify right side
    20,769.12x = 282,889,713.60
  5. Step 5: Solve for x
    x = 282,889,713.60/20,769.12
  6. Step 6: Final answer
    x = 13,620.69

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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.