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Finding the Fourth Proportional to 418.08, 628.20 and 315.48

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Solution

The fourth proportional to 418.08, 628.20 and 315.48 is: 474.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.08 : 628.20 = 315.48 : x
  2. Step 2: Convert to fraction form
    418.08/628.20 = 315.48/x
  3. Step 3: Cross multiply
    418.08x = 628.20 × 315.48
  4. Step 4: Simplify right side
    418.08x = 198,184.54
  5. Step 5: Solve for x
    x = 198,184.54/418.08
  6. Step 6: Final answer
    x = 474.03

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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.