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Finding the Fourth Proportional to 2,758.70, 4,138.05 and 910.10

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Solution

The fourth proportional to 2,758.70, 4,138.05 and 910.10 is: 1,365.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,758.70 : 4,138.05 = 910.10 : x
  2. Step 2: Convert to fraction form
    2,758.70/4,138.05 = 910.10/x
  3. Step 3: Cross multiply
    2,758.70x = 4,138.05 × 910.10
  4. Step 4: Simplify right side
    2,758.70x = 3,766,039.31
  5. Step 5: Solve for x
    x = 3,766,039.31/2,758.70
  6. Step 6: Final answer
    x = 1,365.15

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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.