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Finding the Fourth Proportional to 15,691.59, 21,654.88 and 8,618.00

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Solution

The fourth proportional to 15,691.59, 21,654.88 and 8,618.00 is: 11,893.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.59 : 21,654.88 = 8,618.00 : x
  2. Step 2: Convert to fraction form
    15,691.59/21,654.88 = 8,618.00/x
  3. Step 3: Cross multiply
    15,691.59x = 21,654.88 × 8,618.00
  4. Step 4: Simplify right side
    15,691.59x = 186,621,626.02
  5. Step 5: Solve for x
    x = 186,621,626.02/15,691.59
  6. Step 6: Final answer
    x = 11,893.10

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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.