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Finding the Fourth Proportional to 15,691.88, 21,654.81 and 8,618.78

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Solution

The fourth proportional to 15,691.88, 21,654.81 and 8,618.78 is: 11,893.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.88 : 21,654.81 = 8,618.78 : x
  2. Step 2: Convert to fraction form
    15,691.88/21,654.81 = 8,618.78/x
  3. Step 3: Cross multiply
    15,691.88x = 21,654.81 × 8,618.78
  4. Step 4: Simplify right side
    15,691.88x = 186,638,043.33
  5. Step 5: Solve for x
    x = 186,638,043.33/15,691.88
  6. Step 6: Final answer
    x = 11,893.92

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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.