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Finding the Fourth Proportional to 745.38, 1,118.39 and 398.70

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Solution

The fourth proportional to 745.38, 1,118.39 and 398.70 is: 598.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.38 : 1,118.39 = 398.70 : x
  2. Step 2: Convert to fraction form
    745.38/1,118.39 = 398.70/x
  3. Step 3: Cross multiply
    745.38x = 1,118.39 × 398.70
  4. Step 4: Simplify right side
    745.38x = 445,900.10
  5. Step 5: Solve for x
    x = 445,900.10/745.38
  6. Step 6: Final answer
    x = 598.22

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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.