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Finding the Fourth Proportional to 6,639.72, 9,161.55 and 3,986.16

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Solution

The fourth proportional to 6,639.72, 9,161.55 and 3,986.16 is: 5,500.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.72 : 9,161.55 = 3,986.16 : x
  2. Step 2: Convert to fraction form
    6,639.72/9,161.55 = 3,986.16/x
  3. Step 3: Cross multiply
    6,639.72x = 9,161.55 × 3,986.16
  4. Step 4: Simplify right side
    6,639.72x = 36,519,404.15
  5. Step 5: Solve for x
    x = 36,519,404.15/6,639.72
  6. Step 6: Final answer
    x = 5,500.14

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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.