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Finding the Fourth Proportional to 418.85, 628.39 and 236.39

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Solution

The fourth proportional to 418.85, 628.39 and 236.39 is: 354.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.85 : 628.39 = 236.39 : x
  2. Step 2: Convert to fraction form
    418.85/628.39 = 236.39/x
  3. Step 3: Cross multiply
    418.85x = 628.39 × 236.39
  4. Step 4: Simplify right side
    418.85x = 148,545.11
  5. Step 5: Solve for x
    x = 148,545.11/418.85
  6. Step 6: Final answer
    x = 354.65

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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.