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Finding the Fourth Proportional to 18,642.66, 27,908.46 and 12,381

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Solution

The fourth proportional to 18,642.66, 27,908.46 and 12,381 is: 18,534.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,642.66 : 27,908.46 = 12,381 : x
  2. Step 2: Convert to fraction form
    18,642.66/27,908.46 = 12,381/x
  3. Step 3: Cross multiply
    18,642.66x = 27,908.46 × 12,381
  4. Step 4: Simplify right side
    18,642.66x = 345,534,643.26
  5. Step 5: Solve for x
    x = 345,534,643.26/18,642.66
  6. Step 6: Final answer
    x = 18,534.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.