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Finding the Fourth Proportional to 3,318.86, 4,977.72 and 1,238.65

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Solution

The fourth proportional to 3,318.86, 4,977.72 and 1,238.65 is: 1,857.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.86 : 4,977.72 = 1,238.65 : x
  2. Step 2: Convert to fraction form
    3,318.86/4,977.72 = 1,238.65/x
  3. Step 3: Cross multiply
    3,318.86x = 4,977.72 × 1,238.65
  4. Step 4: Simplify right side
    3,318.86x = 6,165,640.43
  5. Step 5: Solve for x
    x = 6,165,640.43/3,318.86
  6. Step 6: Final answer
    x = 1,857.76

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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.