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Finding the Fourth Proportional to 15,191.19, 20,965.29 and 9,221.49

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Solution

The fourth proportional to 15,191.19, 20,965.29 and 9,221.49 is: 12,726.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,191.19 : 20,965.29 = 9,221.49 : x
  2. Step 2: Convert to fraction form
    15,191.19/20,965.29 = 9,221.49/x
  3. Step 3: Cross multiply
    15,191.19x = 20,965.29 × 9,221.49
  4. Step 4: Simplify right side
    15,191.19x = 193,331,212.08
  5. Step 5: Solve for x
    x = 193,331,212.08/15,191.19
  6. Step 6: Final answer
    x = 12,726.54

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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.