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Finding the Fourth Proportional to 418.72, 628.03 and 311.17

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Solution

The fourth proportional to 418.72, 628.03 and 311.17 is: 466.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.72 : 628.03 = 311.17 : x
  2. Step 2: Convert to fraction form
    418.72/628.03 = 311.17/x
  3. Step 3: Cross multiply
    418.72x = 628.03 × 311.17
  4. Step 4: Simplify right side
    418.72x = 195,424.10
  5. Step 5: Solve for x
    x = 195,424.10/418.72
  6. Step 6: Final answer
    x = 466.72

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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.