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Finding the Fourth Proportional to 15,481.86, 21,365.02 and 8,408.40

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Solution

The fourth proportional to 15,481.86, 21,365.02 and 8,408.40 is: 11,603.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,481.86 : 21,365.02 = 8,408.40 : x
  2. Step 2: Convert to fraction form
    15,481.86/21,365.02 = 8,408.40/x
  3. Step 3: Cross multiply
    15,481.86x = 21,365.02 × 8,408.40
  4. Step 4: Simplify right side
    15,481.86x = 179,645,634.17
  5. Step 5: Solve for x
    x = 179,645,634.17/15,481.86
  6. Step 6: Final answer
    x = 11,603.62

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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.