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Finding the Fourth Proportional to 2,225.85, 3,338.76 and 765

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Solution

The fourth proportional to 2,225.85, 3,338.76 and 765 is: 1,147.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,225.85 : 3,338.76 = 765 : x
  2. Step 2: Convert to fraction form
    2,225.85/3,338.76 = 765/x
  3. Step 3: Cross multiply
    2,225.85x = 3,338.76 × 765
  4. Step 4: Simplify right side
    2,225.85x = 2,554,151.40
  5. Step 5: Solve for x
    x = 2,554,151.40/2,225.85
  6. Step 6: Final answer
    x = 1,147.49

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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.