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Finding the Fourth Proportional to 15,186.69, 20,959.94 and 9,217.21

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Solution

The fourth proportional to 15,186.69, 20,959.94 and 9,217.21 is: 12,721.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,186.69 : 20,959.94 = 9,217.21 : x
  2. Step 2: Convert to fraction form
    15,186.69/20,959.94 = 9,217.21/x
  3. Step 3: Cross multiply
    15,186.69x = 20,959.94 × 9,217.21
  4. Step 4: Simplify right side
    15,186.69x = 193,192,063.77
  5. Step 5: Solve for x
    x = 193,192,063.77/15,186.69
  6. Step 6: Final answer
    x = 12,721.14

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1.5x scale

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.