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Finding the Fourth Proportional to 15,710.60, 21,680.08 and 8,636.97

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Solution

The fourth proportional to 15,710.60, 21,680.08 and 8,636.97 is: 11,918.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.60 : 21,680.08 = 8,636.97 : x
  2. Step 2: Convert to fraction form
    15,710.60/21,680.08 = 8,636.97/x
  3. Step 3: Cross multiply
    15,710.60x = 21,680.08 × 8,636.97
  4. Step 4: Simplify right side
    15,710.60x = 187,250,178.97
  5. Step 5: Solve for x
    x = 187,250,178.97/15,710.60
  6. Step 6: Final answer
    x = 11,918.71

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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.