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Finding the Fourth Proportional to 48,479.20, 72,661.20 and 20,399.20

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Solution

The fourth proportional to 48,479.20, 72,661.20 and 20,399.20 is: 30,574.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,479.20 : 72,661.20 = 20,399.20 : x
  2. Step 2: Convert to fraction form
    48,479.20/72,661.20 = 20,399.20/x
  3. Step 3: Cross multiply
    48,479.20x = 72,661.20 × 20,399.20
  4. Step 4: Simplify right side
    48,479.20x = 1,482,230,351.04
  5. Step 5: Solve for x
    x = 1,482,230,351.04/48,479.20
  6. Step 6: Final answer
    x = 30,574.56

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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.