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Finding the Fourth Proportional to 12,392.88, 18,471.60 and 11,988

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Solution

The fourth proportional to 12,392.88, 18,471.60 and 11,988 is: 17,868.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,392.88 : 18,471.60 = 11,988 : x
  2. Step 2: Convert to fraction form
    12,392.88/18,471.60 = 11,988/x
  3. Step 3: Cross multiply
    12,392.88x = 18,471.60 × 11,988
  4. Step 4: Simplify right side
    12,392.88x = 221,437,540.80
  5. Step 5: Solve for x
    x = 221,437,540.80/12,392.88
  6. Step 6: Final answer
    x = 17,868.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.