Home / 20,724.76-31,086.78-5,142.16

Finding the Fourth Proportional to 20,724.76, 31,086.78 and 5,142.16

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Solution

The fourth proportional to 20,724.76, 31,086.78 and 5,142.16 is: 7,713.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,724.76 : 31,086.78 = 5,142.16 : x
  2. Step 2: Convert to fraction form
    20,724.76/31,086.78 = 5,142.16/x
  3. Step 3: Cross multiply
    20,724.76x = 31,086.78 × 5,142.16
  4. Step 4: Simplify right side
    20,724.76x = 159,853,196.64
  5. Step 5: Solve for x
    x = 159,853,196.64/20,724.76
  6. Step 6: Final answer
    x = 7,713.15

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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.