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Finding the Fourth Proportional to 1,338.80, 1,847.78 and 749.22

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Solution

The fourth proportional to 1,338.80, 1,847.78 and 749.22 is: 1,034.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.80 : 1,847.78 = 749.22 : x
  2. Step 2: Convert to fraction form
    1,338.80/1,847.78 = 749.22/x
  3. Step 3: Cross multiply
    1,338.80x = 1,847.78 × 749.22
  4. Step 4: Simplify right side
    1,338.80x = 1,384,389.99
  5. Step 5: Solve for x
    x = 1,384,389.99/1,338.80
  6. Step 6: Final answer
    x = 1,034.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.