Home / 20,982.90-31,478.98-6,947.30

Finding the Fourth Proportional to 20,982.90, 31,478.98 and 6,947.30

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Solution

The fourth proportional to 20,982.90, 31,478.98 and 6,947.30 is: 10,422.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.90 : 31,478.98 = 6,947.30 : x
  2. Step 2: Convert to fraction form
    20,982.90/31,478.98 = 6,947.30/x
  3. Step 3: Cross multiply
    20,982.90x = 31,478.98 × 6,947.30
  4. Step 4: Simplify right side
    20,982.90x = 218,693,917.75
  5. Step 5: Solve for x
    x = 218,693,917.75/20,982.90
  6. Step 6: Final answer
    x = 10,422.48

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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.