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Finding the Fourth Proportional to 2,871.75, 4,307.63 and 819.75

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Solution

The fourth proportional to 2,871.75, 4,307.63 and 819.75 is: 1,229.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.75 : 4,307.63 = 819.75 : x
  2. Step 2: Convert to fraction form
    2,871.75/4,307.63 = 819.75/x
  3. Step 3: Cross multiply
    2,871.75x = 4,307.63 × 819.75
  4. Step 4: Simplify right side
    2,871.75x = 3,531,179.69
  5. Step 5: Solve for x
    x = 3,531,179.69/2,871.75
  6. Step 6: Final answer
    x = 1,229.63

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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.