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Finding the Fourth Proportional to 21,102.88, 29,120.79 and 11,540.87

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Solution

The fourth proportional to 21,102.88, 29,120.79 and 11,540.87 is: 15,925.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,102.88 : 29,120.79 = 11,540.87 : x
  2. Step 2: Convert to fraction form
    21,102.88/29,120.79 = 11,540.87/x
  3. Step 3: Cross multiply
    21,102.88x = 29,120.79 × 11,540.87
  4. Step 4: Simplify right side
    21,102.88x = 336,079,251.69
  5. Step 5: Solve for x
    x = 336,079,251.69/21,102.88
  6. Step 6: Final answer
    x = 15,925.75

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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.