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Finding the Fourth Proportional to 745.38, 1,118.21 and 225.42

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Solution

The fourth proportional to 745.38, 1,118.21 and 225.42 is: 338.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.38 : 1,118.21 = 225.42 : x
  2. Step 2: Convert to fraction form
    745.38/1,118.21 = 225.42/x
  3. Step 3: Cross multiply
    745.38x = 1,118.21 × 225.42
  4. Step 4: Simplify right side
    745.38x = 252,065.77
  5. Step 5: Solve for x
    x = 252,065.77/745.38
  6. Step 6: Final answer
    x = 338.17

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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.