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Finding the Fourth Proportional to 54,009.20, 80,975.40 and 20,716.40

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Solution

The fourth proportional to 54,009.20, 80,975.40 and 20,716.40 is: 31,059.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,009.20 : 80,975.40 = 20,716.40 : x
  2. Step 2: Convert to fraction form
    54,009.20/80,975.40 = 20,716.40/x
  3. Step 3: Cross multiply
    54,009.20x = 80,975.40 × 20,716.40
  4. Step 4: Simplify right side
    54,009.20x = 1,677,518,776.56
  5. Step 5: Solve for x
    x = 1,677,518,776.56/54,009.20
  6. Step 6: Final answer
    x = 31,059.87

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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.