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Finding the Fourth Proportional to 416.38, 624.65 and 142.51

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Solution

The fourth proportional to 416.38, 624.65 and 142.51 is: 213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.38 : 624.65 = 142.51 : x
  2. Step 2: Convert to fraction form
    416.38/624.65 = 142.51/x
  3. Step 3: Cross multiply
    416.38x = 624.65 × 142.51
  4. Step 4: Simplify right side
    416.38x = 89,018.87
  5. Step 5: Solve for x
    x = 89,018.87/416.38
  6. Step 6: Final answer
    x = 213.79

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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.