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Finding the Fourth Proportional to 20,139.20, 30,208.80 and 13,140.80

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Solution

The fourth proportional to 20,139.20, 30,208.80 and 13,140.80 is: 19,711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.20 : 30,208.80 = 13,140.80 : x
  2. Step 2: Convert to fraction form
    20,139.20/30,208.80 = 13,140.80/x
  3. Step 3: Cross multiply
    20,139.20x = 30,208.80 × 13,140.80
  4. Step 4: Simplify right side
    20,139.20x = 396,967,799.04
  5. Step 5: Solve for x
    x = 396,967,799.04/20,139.20
  6. Step 6: Final answer
    x = 19,711.20

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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.