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Finding the Fourth Proportional to 15,189.12, 20,914.20 and 12,945.96

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Solution

The fourth proportional to 15,189.12, 20,914.20 and 12,945.96 is: 17,825.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.12 : 20,914.20 = 12,945.96 : x
  2. Step 2: Convert to fraction form
    15,189.12/20,914.20 = 12,945.96/x
  3. Step 3: Cross multiply
    15,189.12x = 20,914.20 × 12,945.96
  4. Step 4: Simplify right side
    15,189.12x = 270,754,396.63
  5. Step 5: Solve for x
    x = 270,754,396.63/15,189.12
  6. Step 6: Final answer
    x = 17,825.55

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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.