Home / 20,778.40-31,149.06-9,082.36

Finding the Fourth Proportional to 20,778.40, 31,149.06 and 9,082.36

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Solution

The fourth proportional to 20,778.40, 31,149.06 and 9,082.36 is: 13,615.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.40 : 31,149.06 = 9,082.36 : x
  2. Step 2: Convert to fraction form
    20,778.40/31,149.06 = 9,082.36/x
  3. Step 3: Cross multiply
    20,778.40x = 31,149.06 × 9,082.36
  4. Step 4: Simplify right side
    20,778.40x = 282,906,976.58
  5. Step 5: Solve for x
    x = 282,906,976.58/20,778.40
  6. Step 6: Final answer
    x = 13,615.44

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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.