Home / 20,389.78-28,141.05-11,440.90

Finding the Fourth Proportional to 20,389.78, 28,141.05 and 11,440.90

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Solution

The fourth proportional to 20,389.78, 28,141.05 and 11,440.90 is: 15,790.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.78 : 28,141.05 = 11,440.90 : x
  2. Step 2: Convert to fraction form
    20,389.78/28,141.05 = 11,440.90/x
  3. Step 3: Cross multiply
    20,389.78x = 28,141.05 × 11,440.90
  4. Step 4: Simplify right side
    20,389.78x = 321,958,938.95
  5. Step 5: Solve for x
    x = 321,958,938.95/20,389.78
  6. Step 6: Final answer
    x = 15,790.21

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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.