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Finding the Fourth Proportional to 2,763.84, 4,145.20 and 815.56

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Solution

The fourth proportional to 2,763.84, 4,145.20 and 815.56 is: 1,223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,763.84 : 4,145.20 = 815.56 : x
  2. Step 2: Convert to fraction form
    2,763.84/4,145.20 = 815.56/x
  3. Step 3: Cross multiply
    2,763.84x = 4,145.20 × 815.56
  4. Step 4: Simplify right side
    2,763.84x = 3,380,659.31
  5. Step 5: Solve for x
    x = 3,380,659.31/2,763.84
  6. Step 6: Final answer
    x = 1,223.17

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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.