Home / 20,853.12-31,278.60-5,270.88

Finding the Fourth Proportional to 20,853.12, 31,278.60 and 5,270.88

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Solution

The fourth proportional to 20,853.12, 31,278.60 and 5,270.88 is: 7,906.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.12 : 31,278.60 = 5,270.88 : x
  2. Step 2: Convert to fraction form
    20,853.12/31,278.60 = 5,270.88/x
  3. Step 3: Cross multiply
    20,853.12x = 31,278.60 × 5,270.88
  4. Step 4: Simplify right side
    20,853.12x = 164,865,747.17
  5. Step 5: Solve for x
    x = 164,865,747.17/20,853.12
  6. Step 6: Final answer
    x = 7,906.05

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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.