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Finding the Fourth Proportional to 11,211.60, 16,833.60 and 7,939.20

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Solution

The fourth proportional to 11,211.60, 16,833.60 and 7,939.20 is: 11,920.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,211.60 : 16,833.60 = 7,939.20 : x
  2. Step 2: Convert to fraction form
    11,211.60/16,833.60 = 7,939.20/x
  3. Step 3: Cross multiply
    11,211.60x = 16,833.60 × 7,939.20
  4. Step 4: Simplify right side
    11,211.60x = 133,645,317.12
  5. Step 5: Solve for x
    x = 133,645,317.12/11,211.60
  6. Step 6: Final answer
    x = 11,920.27

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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.