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Finding the Fourth Proportional to 416.70, 624.78 and 142.80

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Solution

The fourth proportional to 416.70, 624.78 and 142.80 is: 214.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.70 : 624.78 = 142.80 : x
  2. Step 2: Convert to fraction form
    416.70/624.78 = 142.80/x
  3. Step 3: Cross multiply
    416.70x = 624.78 × 142.80
  4. Step 4: Simplify right side
    416.70x = 89,218.58
  5. Step 5: Solve for x
    x = 89,218.58/416.70
  6. Step 6: Final answer
    x = 214.11

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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.