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Finding the Fourth Proportional to 15,240, 21,034.08 and 8,616

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Solution

The fourth proportional to 15,240, 21,034.08 and 8,616 is: 11,891.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,240 : 21,034.08 = 8,616 : x
  2. Step 2: Convert to fraction form
    15,240/21,034.08 = 8,616/x
  3. Step 3: Cross multiply
    15,240x = 21,034.08 × 8,616
  4. Step 4: Simplify right side
    15,240x = 181,229,633.28
  5. Step 5: Solve for x
    x = 181,229,633.28/15,240
  6. Step 6: Final answer
    x = 11,891.71

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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.