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Finding the Fourth Proportional to 15,091.88, 20,821.08 and 11,122.48

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Solution

The fourth proportional to 15,091.88, 20,821.08 and 11,122.48 is: 15,344.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,091.88 : 20,821.08 = 11,122.48 : x
  2. Step 2: Convert to fraction form
    15,091.88/20,821.08 = 11,122.48/x
  3. Step 3: Cross multiply
    15,091.88x = 20,821.08 × 11,122.48
  4. Step 4: Simplify right side
    15,091.88x = 231,582,045.88
  5. Step 5: Solve for x
    x = 231,582,045.88/15,091.88
  6. Step 6: Final answer
    x = 15,344.81

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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.