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Finding the Fourth Proportional to 416.38, 624.48 and 127.78

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Solution

The fourth proportional to 416.38, 624.48 and 127.78 is: 191.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.38 : 624.48 = 127.78 : x
  2. Step 2: Convert to fraction form
    416.38/624.48 = 127.78/x
  3. Step 3: Cross multiply
    416.38x = 624.48 × 127.78
  4. Step 4: Simplify right side
    416.38x = 79,796.05
  5. Step 5: Solve for x
    x = 79,796.05/416.38
  6. Step 6: Final answer
    x = 191.64

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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.