Home / 20,921.28-31,255.50-13,464.96

Finding the Fourth Proportional to 20,921.28, 31,255.50 and 13,464.96

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Solution

The fourth proportional to 20,921.28, 31,255.50 and 13,464.96 is: 20,116.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.28 : 31,255.50 = 13,464.96 : x
  2. Step 2: Convert to fraction form
    20,921.28/31,255.50 = 13,464.96/x
  3. Step 3: Cross multiply
    20,921.28x = 31,255.50 × 13,464.96
  4. Step 4: Simplify right side
    20,921.28x = 420,854,057.28
  5. Step 5: Solve for x
    x = 420,854,057.28/20,921.28
  6. Step 6: Final answer
    x = 20,116.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.