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Finding the Fourth Proportional to 9,378.79, 13,001.92 and 8,879.42

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Solution

The fourth proportional to 9,378.79, 13,001.92 and 8,879.42 is: 12,309.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.79 : 13,001.92 = 8,879.42 : x
  2. Step 2: Convert to fraction form
    9,378.79/13,001.92 = 8,879.42/x
  3. Step 3: Cross multiply
    9,378.79x = 13,001.92 × 8,879.42
  4. Step 4: Simplify right side
    9,378.79x = 115,449,518.79
  5. Step 5: Solve for x
    x = 115,449,518.79/9,378.79
  6. Step 6: Final answer
    x = 12,309.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.