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Finding the Fourth Proportional to 745.43, 1,118.20 and 300.69

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Solution

The fourth proportional to 745.43, 1,118.20 and 300.69 is: 451.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.43 : 1,118.20 = 300.69 : x
  2. Step 2: Convert to fraction form
    745.43/1,118.20 = 300.69/x
  3. Step 3: Cross multiply
    745.43x = 1,118.20 × 300.69
  4. Step 4: Simplify right side
    745.43x = 336,231.56
  5. Step 5: Solve for x
    x = 336,231.56/745.43
  6. Step 6: Final answer
    x = 451.06

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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.