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Finding the Fourth Proportional to 15,481.90, 21,365.04 and 8,408.31

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Solution

The fourth proportional to 15,481.90, 21,365.04 and 8,408.31 is: 11,603.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,481.90 : 21,365.04 = 8,408.31 : x
  2. Step 2: Convert to fraction form
    15,481.90/21,365.04 = 8,408.31/x
  3. Step 3: Cross multiply
    15,481.90x = 21,365.04 × 8,408.31
  4. Step 4: Simplify right side
    15,481.90x = 179,643,879.48
  5. Step 5: Solve for x
    x = 179,643,879.48/15,481.90
  6. Step 6: Final answer
    x = 11,603.48

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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.