Home / 20,971.20-31,456.80-5,388.72

Finding the Fourth Proportional to 20,971.20, 31,456.80 and 5,388.72

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Solution

The fourth proportional to 20,971.20, 31,456.80 and 5,388.72 is: 8,083.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.20 : 31,456.80 = 5,388.72 : x
  2. Step 2: Convert to fraction form
    20,971.20/31,456.80 = 5,388.72/x
  3. Step 3: Cross multiply
    20,971.20x = 31,456.80 × 5,388.72
  4. Step 4: Simplify right side
    20,971.20x = 169,511,887.30
  5. Step 5: Solve for x
    x = 169,511,887.30/20,971.20
  6. Step 6: Final answer
    x = 8,083.08

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1.5x scale

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.