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Finding the Fourth Proportional to 2,759.84, 4,139.82 and 812.24

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Solution

The fourth proportional to 2,759.84, 4,139.82 and 812.24 is: 1,218.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.84 : 4,139.82 = 812.24 : x
  2. Step 2: Convert to fraction form
    2,759.84/4,139.82 = 812.24/x
  3. Step 3: Cross multiply
    2,759.84x = 4,139.82 × 812.24
  4. Step 4: Simplify right side
    2,759.84x = 3,362,527.40
  5. Step 5: Solve for x
    x = 3,362,527.40/2,759.84
  6. Step 6: Final answer
    x = 1,218.38

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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.