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Finding the Fourth Proportional to 15,187.25, 20,910.74 and 12,914.12

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Solution

The fourth proportional to 15,187.25, 20,910.74 and 12,914.12 is: 17,780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,187.25 : 20,910.74 = 12,914.12 : x
  2. Step 2: Convert to fraction form
    15,187.25/20,910.74 = 12,914.12/x
  3. Step 3: Cross multiply
    15,187.25x = 20,910.74 × 12,914.12
  4. Step 4: Simplify right side
    15,187.25x = 270,043,636.52
  5. Step 5: Solve for x
    x = 270,043,636.52/15,187.25
  6. Step 6: Final answer
    x = 17,780.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.