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Finding the Fourth Proportional to 2,717.52, 4,075.80 and 769.20

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Solution

The fourth proportional to 2,717.52, 4,075.80 and 769.20 is: 1,153.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,717.52 : 4,075.80 = 769.20 : x
  2. Step 2: Convert to fraction form
    2,717.52/4,075.80 = 769.20/x
  3. Step 3: Cross multiply
    2,717.52x = 4,075.80 × 769.20
  4. Step 4: Simplify right side
    2,717.52x = 3,135,105.36
  5. Step 5: Solve for x
    x = 3,135,105.36/2,717.52
  6. Step 6: Final answer
    x = 1,153.66

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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.