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Finding the Fourth Proportional to 418.29, 627.32 and 125.78

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Solution

The fourth proportional to 418.29, 627.32 and 125.78 is: 188.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.29 : 627.32 = 125.78 : x
  2. Step 2: Convert to fraction form
    418.29/627.32 = 125.78/x
  3. Step 3: Cross multiply
    418.29x = 627.32 × 125.78
  4. Step 4: Simplify right side
    418.29x = 78,904.31
  5. Step 5: Solve for x
    x = 78,904.31/418.29
  6. Step 6: Final answer
    x = 188.64

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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.