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Finding the Fourth Proportional to 12,169.60, 16,798.80 and 7,979.20

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Solution

The fourth proportional to 12,169.60, 16,798.80 and 7,979.20 is: 11,014.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,169.60 : 16,798.80 = 7,979.20 : x
  2. Step 2: Convert to fraction form
    12,169.60/16,798.80 = 7,979.20/x
  3. Step 3: Cross multiply
    12,169.60x = 16,798.80 × 7,979.20
  4. Step 4: Simplify right side
    12,169.60x = 134,040,984.96
  5. Step 5: Solve for x
    x = 134,040,984.96/12,169.60
  6. Step 6: Final answer
    x = 11,014.41

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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.