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Finding the Fourth Proportional to 15,736.38, 21,715.38 and 8,661.42

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Solution

The fourth proportional to 15,736.38, 21,715.38 and 8,661.42 is: 11,952.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,736.38 : 21,715.38 = 8,661.42 : x
  2. Step 2: Convert to fraction form
    15,736.38/21,715.38 = 8,661.42/x
  3. Step 3: Cross multiply
    15,736.38x = 21,715.38 × 8,661.42
  4. Step 4: Simplify right side
    15,736.38x = 188,086,026.64
  5. Step 5: Solve for x
    x = 188,086,026.64/15,736.38
  6. Step 6: Final answer
    x = 11,952.31

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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.