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Finding the Fourth Proportional to 418.17, 626.78 and 315.14

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Solution

The fourth proportional to 418.17, 626.78 and 315.14 is: 472.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.17 : 626.78 = 315.14 : x
  2. Step 2: Convert to fraction form
    418.17/626.78 = 315.14/x
  3. Step 3: Cross multiply
    418.17x = 626.78 × 315.14
  4. Step 4: Simplify right side
    418.17x = 197,521.10
  5. Step 5: Solve for x
    x = 197,521.10/418.17
  6. Step 6: Final answer
    x = 472.35

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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.