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Finding the Fourth Proportional to 57,660.89, 86,490.82 and 18,218

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Solution

The fourth proportional to 57,660.89, 86,490.82 and 18,218 is: 27,326.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,660.89 : 86,490.82 = 18,218 : x
  2. Step 2: Convert to fraction form
    57,660.89/86,490.82 = 18,218/x
  3. Step 3: Cross multiply
    57,660.89x = 86,490.82 × 18,218
  4. Step 4: Simplify right side
    57,660.89x = 1,575,689,758.76
  5. Step 5: Solve for x
    x = 1,575,689,758.76/57,660.89
  6. Step 6: Final answer
    x = 27,326.84

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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.