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Finding the Fourth Proportional to 2,815, 4,222.50 and 763

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Solution

The fourth proportional to 2,815, 4,222.50 and 763 is: 1,144.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815 : 4,222.50 = 763 : x
  2. Step 2: Convert to fraction form
    2,815/4,222.50 = 763/x
  3. Step 3: Cross multiply
    2,815x = 4,222.50 × 763
  4. Step 4: Simplify right side
    2,815x = 3,221,767.50
  5. Step 5: Solve for x
    x = 3,221,767.50/2,815
  6. Step 6: Final answer
    x = 1,144.50

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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.