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Finding the Fourth Proportional to 416.85, 624.74 and 211.31

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Solution

The fourth proportional to 416.85, 624.74 and 211.31 is: 316.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.85 : 624.74 = 211.31 : x
  2. Step 2: Convert to fraction form
    416.85/624.74 = 211.31/x
  3. Step 3: Cross multiply
    416.85x = 624.74 × 211.31
  4. Step 4: Simplify right side
    416.85x = 132,009.63
  5. Step 5: Solve for x
    x = 132,009.63/416.85
  6. Step 6: Final answer
    x = 316.68

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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.