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Finding the Fourth Proportional to 7,998.72, 11,991.60 and 3,613.92

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Solution

The fourth proportional to 7,998.72, 11,991.60 and 3,613.92 is: 5,417.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,998.72 : 11,991.60 = 3,613.92 : x
  2. Step 2: Convert to fraction form
    7,998.72/11,991.60 = 3,613.92/x
  3. Step 3: Cross multiply
    7,998.72x = 11,991.60 × 3,613.92
  4. Step 4: Simplify right side
    7,998.72x = 43,336,683.07
  5. Step 5: Solve for x
    x = 43,336,683.07/7,998.72
  6. Step 6: Final answer
    x = 5,417.95

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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.