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Finding the Fourth Proportional to 416.34, 624.45 and 221.10

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Solution

The fourth proportional to 416.34, 624.45 and 221.10 is: 331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.34 : 624.45 = 221.10 : x
  2. Step 2: Convert to fraction form
    416.34/624.45 = 221.10/x
  3. Step 3: Cross multiply
    416.34x = 624.45 × 221.10
  4. Step 4: Simplify right side
    416.34x = 138,065.90
  5. Step 5: Solve for x
    x = 138,065.90/416.34
  6. Step 6: Final answer
    x = 331.62

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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.