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Finding the Fourth Proportional to 15,425.31, 21,286.94 and 8,351.74

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Solution

The fourth proportional to 15,425.31, 21,286.94 and 8,351.74 is: 11,525.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,425.31 : 21,286.94 = 8,351.74 : x
  2. Step 2: Convert to fraction form
    15,425.31/21,286.94 = 8,351.74/x
  3. Step 3: Cross multiply
    15,425.31x = 21,286.94 × 8,351.74
  4. Step 4: Simplify right side
    15,425.31x = 177,782,988.28
  5. Step 5: Solve for x
    x = 177,782,988.28/15,425.31
  6. Step 6: Final answer
    x = 11,525.41

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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.