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Finding the Fourth Proportional to 418.36, 627.50 and 129.78

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Solution

The fourth proportional to 418.36, 627.50 and 129.78 is: 194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.36 : 627.50 = 129.78 : x
  2. Step 2: Convert to fraction form
    418.36/627.50 = 129.78/x
  3. Step 3: Cross multiply
    418.36x = 627.50 × 129.78
  4. Step 4: Simplify right side
    418.36x = 81,436.95
  5. Step 5: Solve for x
    x = 81,436.95/418.36
  6. Step 6: Final answer
    x = 194.66

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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.