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Finding the Fourth Proportional to 20,139.20, 30,151.20 and 19,563.20

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Solution

The fourth proportional to 20,139.20, 30,151.20 and 19,563.20 is: 29,288.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.20 : 30,151.20 = 19,563.20 : x
  2. Step 2: Convert to fraction form
    20,139.20/30,151.20 = 19,563.20/x
  3. Step 3: Cross multiply
    20,139.20x = 30,151.20 × 19,563.20
  4. Step 4: Simplify right side
    20,139.20x = 589,853,955.84
  5. Step 5: Solve for x
    x = 589,853,955.84/20,139.20
  6. Step 6: Final answer
    x = 29,288.85

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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.