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Finding the Fourth Proportional to 13,129.92, 18,113.54 and 8,879.48

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Solution

The fourth proportional to 13,129.92, 18,113.54 and 8,879.48 is: 12,249.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.92 : 18,113.54 = 8,879.48 : x
  2. Step 2: Convert to fraction form
    13,129.92/18,113.54 = 8,879.48/x
  3. Step 3: Cross multiply
    13,129.92x = 18,113.54 × 8,879.48
  4. Step 4: Simplify right side
    13,129.92x = 160,838,816.16
  5. Step 5: Solve for x
    x = 160,838,816.16/13,129.92
  6. Step 6: Final answer
    x = 12,249.79

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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.