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Finding the Fourth Proportional to 6,636.86, 9,155.79 and 3,979.65

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Solution

The fourth proportional to 6,636.86, 9,155.79 and 3,979.65 is: 5,490.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,636.86 : 9,155.79 = 3,979.65 : x
  2. Step 2: Convert to fraction form
    6,636.86/9,155.79 = 3,979.65/x
  3. Step 3: Cross multiply
    6,636.86x = 9,155.79 × 3,979.65
  4. Step 4: Simplify right side
    6,636.86x = 36,436,839.67
  5. Step 5: Solve for x
    x = 36,436,839.67/6,636.86
  6. Step 6: Final answer
    x = 5,490.07

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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.