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Finding the Fourth Proportional to 18,722.88, 28,081.08 and 10,268.40

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Solution

The fourth proportional to 18,722.88, 28,081.08 and 10,268.40 is: 15,400.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.88 : 28,081.08 = 10,268.40 : x
  2. Step 2: Convert to fraction form
    18,722.88/28,081.08 = 10,268.40/x
  3. Step 3: Cross multiply
    18,722.88x = 28,081.08 × 10,268.40
  4. Step 4: Simplify right side
    18,722.88x = 288,347,761.87
  5. Step 5: Solve for x
    x = 288,347,761.87/18,722.88
  6. Step 6: Final answer
    x = 15,400.82

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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.