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Finding the Fourth Proportional to 416.38, 624.64 and 127.75

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Solution

The fourth proportional to 416.38, 624.64 and 127.75 is: 191.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.38 : 624.64 = 127.75 : x
  2. Step 2: Convert to fraction form
    416.38/624.64 = 127.75/x
  3. Step 3: Cross multiply
    416.38x = 624.64 × 127.75
  4. Step 4: Simplify right side
    416.38x = 79,797.76
  5. Step 5: Solve for x
    x = 79,797.76/416.38
  6. Step 6: Final answer
    x = 191.65

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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.