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Finding the Fourth Proportional to 416.20, 624.30 and 210.80

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Solution

The fourth proportional to 416.20, 624.30 and 210.80 is: 316.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.20 : 624.30 = 210.80 : x
  2. Step 2: Convert to fraction form
    416.20/624.30 = 210.80/x
  3. Step 3: Cross multiply
    416.20x = 624.30 × 210.80
  4. Step 4: Simplify right side
    416.20x = 131,602.44
  5. Step 5: Solve for x
    x = 131,602.44/416.20
  6. Step 6: Final answer
    x = 316.20

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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.