Home / 20,731.90-28,610.78-11,780.90

Finding the Fourth Proportional to 20,731.90, 28,610.78 and 11,780.90

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Solution

The fourth proportional to 20,731.90, 28,610.78 and 11,780.90 is: 16,258.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.90 : 28,610.78 = 11,780.90 : x
  2. Step 2: Convert to fraction form
    20,731.90/28,610.78 = 11,780.90/x
  3. Step 3: Cross multiply
    20,731.90x = 28,610.78 × 11,780.90
  4. Step 4: Simplify right side
    20,731.90x = 337,060,750.72
  5. Step 5: Solve for x
    x = 337,060,750.72/20,731.90
  6. Step 6: Final answer
    x = 16,258.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.