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Finding the Fourth Proportional to 416.14, 624.17 and 127.78

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Solution

The fourth proportional to 416.14, 624.17 and 127.78 is: 191.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.14 : 624.17 = 127.78 : x
  2. Step 2: Convert to fraction form
    416.14/624.17 = 127.78/x
  3. Step 3: Cross multiply
    416.14x = 624.17 × 127.78
  4. Step 4: Simplify right side
    416.14x = 79,756.44
  5. Step 5: Solve for x
    x = 79,756.44/416.14
  6. Step 6: Final answer
    x = 191.66

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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.