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Finding the Fourth Proportional to 418.69, 627.99 and 130.15

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Solution

The fourth proportional to 418.69, 627.99 and 130.15 is: 195.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.69 : 627.99 = 130.15 : x
  2. Step 2: Convert to fraction form
    418.69/627.99 = 130.15/x
  3. Step 3: Cross multiply
    418.69x = 627.99 × 130.15
  4. Step 4: Simplify right side
    418.69x = 81,732.90
  5. Step 5: Solve for x
    x = 81,732.90/418.69
  6. Step 6: Final answer
    x = 195.21

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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.