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Finding the Fourth Proportional to 12,221.69, 16,865.42 and 6,916.79

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Solution

The fourth proportional to 12,221.69, 16,865.42 and 6,916.79 is: 9,544.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.69 : 16,865.42 = 6,916.79 : x
  2. Step 2: Convert to fraction form
    12,221.69/16,865.42 = 6,916.79/x
  3. Step 3: Cross multiply
    12,221.69x = 16,865.42 × 6,916.79
  4. Step 4: Simplify right side
    12,221.69x = 116,654,575.98
  5. Step 5: Solve for x
    x = 116,654,575.98/12,221.69
  6. Step 6: Final answer
    x = 9,544.88

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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.