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Finding the Fourth Proportional to 15,691.84, 21,654.84 and 8,618.20

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Solution

The fourth proportional to 15,691.84, 21,654.84 and 8,618.20 is: 11,893.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.84 : 21,654.84 = 8,618.20 : x
  2. Step 2: Convert to fraction form
    15,691.84/21,654.84 = 8,618.20/x
  3. Step 3: Cross multiply
    15,691.84x = 21,654.84 × 8,618.20
  4. Step 4: Simplify right side
    15,691.84x = 186,625,742.09
  5. Step 5: Solve for x
    x = 186,625,742.09/15,691.84
  6. Step 6: Final answer
    x = 11,893.17

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.