Home / 20,727.28-31,090.60-5,145.04

Finding the Fourth Proportional to 20,727.28, 31,090.60 and 5,145.04

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Solution

The fourth proportional to 20,727.28, 31,090.60 and 5,145.04 is: 7,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,727.28 : 31,090.60 = 5,145.04 : x
  2. Step 2: Convert to fraction form
    20,727.28/31,090.60 = 5,145.04/x
  3. Step 3: Cross multiply
    20,727.28x = 31,090.60 × 5,145.04
  4. Step 4: Simplify right side
    20,727.28x = 159,962,380.62
  5. Step 5: Solve for x
    x = 159,962,380.62/20,727.28
  6. Step 6: Final answer
    x = 7,717.48

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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.