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Finding the Fourth Proportional to 15,419.56, 21,279 and 8,346

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Solution

The fourth proportional to 15,419.56, 21,279 and 8,346 is: 11,517.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,419.56 : 21,279 = 8,346 : x
  2. Step 2: Convert to fraction form
    15,419.56/21,279 = 8,346/x
  3. Step 3: Cross multiply
    15,419.56x = 21,279 × 8,346
  4. Step 4: Simplify right side
    15,419.56x = 177,594,534
  5. Step 5: Solve for x
    x = 177,594,534/15,419.56
  6. Step 6: Final answer
    x = 11,517.48

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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.