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Finding the Fourth Proportional to 12,608.48, 18,921.84 and 8,456.48

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Solution

The fourth proportional to 12,608.48, 18,921.84 and 8,456.48 is: 12,690.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,608.48 : 18,921.84 = 8,456.48 : x
  2. Step 2: Convert to fraction form
    12,608.48/18,921.84 = 8,456.48/x
  3. Step 3: Cross multiply
    12,608.48x = 18,921.84 × 8,456.48
  4. Step 4: Simplify right side
    12,608.48x = 160,012,161.52
  5. Step 5: Solve for x
    x = 160,012,161.52/12,608.48
  6. Step 6: Final answer
    x = 12,690.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.