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Finding the Fourth Proportional to 15,305, 21,120.90 and 8,681

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Solution

The fourth proportional to 15,305, 21,120.90 and 8,681 is: 11,979.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,305 : 21,120.90 = 8,681 : x
  2. Step 2: Convert to fraction form
    15,305/21,120.90 = 8,681/x
  3. Step 3: Cross multiply
    15,305x = 21,120.90 × 8,681
  4. Step 4: Simplify right side
    15,305x = 183,350,532.90
  5. Step 5: Solve for x
    x = 183,350,532.90/15,305
  6. Step 6: Final answer
    x = 11,979.78

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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.