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Finding the Fourth Proportional to 415.66, 623.67 and 199.21

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Solution

The fourth proportional to 415.66, 623.67 and 199.21 is: 298.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.66 : 623.67 = 199.21 : x
  2. Step 2: Convert to fraction form
    415.66/623.67 = 199.21/x
  3. Step 3: Cross multiply
    415.66x = 623.67 × 199.21
  4. Step 4: Simplify right side
    415.66x = 124,241.30
  5. Step 5: Solve for x
    x = 124,241.30/415.66
  6. Step 6: Final answer
    x = 298.90

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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.