Home / 21,115.97-28,984.80-18,672.39

Finding the Fourth Proportional to 21,115.97, 28,984.80 and 18,672.39

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Solution

The fourth proportional to 21,115.97, 28,984.80 and 18,672.39 is: 25,630.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.97 : 28,984.80 = 18,672.39 : x
  2. Step 2: Convert to fraction form
    21,115.97/28,984.80 = 18,672.39/x
  3. Step 3: Cross multiply
    21,115.97x = 28,984.80 × 18,672.39
  4. Step 4: Simplify right side
    21,115.97x = 541,215,344.75
  5. Step 5: Solve for x
    x = 541,215,344.75/21,115.97
  6. Step 6: Final answer
    x = 25,630.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.