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Finding the Fourth Proportional to 6,636.42, 9,155.19 and 3,979.21

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Solution

The fourth proportional to 6,636.42, 9,155.19 and 3,979.21 is: 5,489.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,636.42 : 9,155.19 = 3,979.21 : x
  2. Step 2: Convert to fraction form
    6,636.42/9,155.19 = 3,979.21/x
  3. Step 3: Cross multiply
    6,636.42x = 9,155.19 × 3,979.21
  4. Step 4: Simplify right side
    6,636.42x = 36,430,423.60
  5. Step 5: Solve for x
    x = 36,430,423.60/6,636.42
  6. Step 6: Final answer
    x = 5,489.47

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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.