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Finding the Fourth Proportional to 21,691.44, 29,923.84 and 12,616.76

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Solution

The fourth proportional to 21,691.44, 29,923.84 and 12,616.76 is: 17,405.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.44 : 29,923.84 = 12,616.76 : x
  2. Step 2: Convert to fraction form
    21,691.44/29,923.84 = 12,616.76/x
  3. Step 3: Cross multiply
    21,691.44x = 29,923.84 × 12,616.76
  4. Step 4: Simplify right side
    21,691.44x = 377,541,907.56
  5. Step 5: Solve for x
    x = 377,541,907.56/21,691.44
  6. Step 6: Final answer
    x = 17,405.11

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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.