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Finding the Fourth Proportional to 418.14, 628.34 and 356.64

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Solution

The fourth proportional to 418.14, 628.34 and 356.64 is: 535.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.14 : 628.34 = 356.64 : x
  2. Step 2: Convert to fraction form
    418.14/628.34 = 356.64/x
  3. Step 3: Cross multiply
    418.14x = 628.34 × 356.64
  4. Step 4: Simplify right side
    418.14x = 224,089.39
  5. Step 5: Solve for x
    x = 224,089.39/418.14
  6. Step 6: Final answer
    x = 535.92

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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.