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Finding the Fourth Proportional to 418.02, 626.91 and 129.42

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Solution

The fourth proportional to 418.02, 626.91 and 129.42 is: 194.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.02 : 626.91 = 129.42 : x
  2. Step 2: Convert to fraction form
    418.02/626.91 = 129.42/x
  3. Step 3: Cross multiply
    418.02x = 626.91 × 129.42
  4. Step 4: Simplify right side
    418.02x = 81,134.69
  5. Step 5: Solve for x
    x = 81,134.69/418.02
  6. Step 6: Final answer
    x = 194.09

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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.