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Finding the Fourth Proportional to 2,765.91, 4,145.61 and 1,939.71

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Solution

The fourth proportional to 2,765.91, 4,145.61 and 1,939.71 is: 2,907.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.91 : 4,145.61 = 1,939.71 : x
  2. Step 2: Convert to fraction form
    2,765.91/4,145.61 = 1,939.71/x
  3. Step 3: Cross multiply
    2,765.91x = 4,145.61 × 1,939.71
  4. Step 4: Simplify right side
    2,765.91x = 8,041,281.17
  5. Step 5: Solve for x
    x = 8,041,281.17/2,765.91
  6. Step 6: Final answer
    x = 2,907.28

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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.