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Finding the Fourth Proportional to 15,481.95, 21,364.74 and 8,408.22

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Solution

The fourth proportional to 15,481.95, 21,364.74 and 8,408.22 is: 11,603.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,481.95 : 21,364.74 = 8,408.22 : x
  2. Step 2: Convert to fraction form
    15,481.95/21,364.74 = 8,408.22/x
  3. Step 3: Cross multiply
    15,481.95x = 21,364.74 × 8,408.22
  4. Step 4: Simplify right side
    15,481.95x = 179,639,434.16
  5. Step 5: Solve for x
    x = 179,639,434.16/15,481.95
  6. Step 6: Final answer
    x = 11,603.15

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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.