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Finding the Fourth Proportional to 2,759.85, 4,138.34 and 910.76

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Solution

The fourth proportional to 2,759.85, 4,138.34 and 910.76 is: 1,365.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.85 : 4,138.34 = 910.76 : x
  2. Step 2: Convert to fraction form
    2,759.85/4,138.34 = 910.76/x
  3. Step 3: Cross multiply
    2,759.85x = 4,138.34 × 910.76
  4. Step 4: Simplify right side
    2,759.85x = 3,769,009.29
  5. Step 5: Solve for x
    x = 3,769,009.29/2,759.85
  6. Step 6: Final answer
    x = 1,365.66

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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.