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Finding the Fourth Proportional to 399.55, 551.11 and 252.06

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Solution

The fourth proportional to 399.55, 551.11 and 252.06 is: 347.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.55 : 551.11 = 252.06 : x
  2. Step 2: Convert to fraction form
    399.55/551.11 = 252.06/x
  3. Step 3: Cross multiply
    399.55x = 551.11 × 252.06
  4. Step 4: Simplify right side
    399.55x = 138,912.79
  5. Step 5: Solve for x
    x = 138,912.79/399.55
  6. Step 6: Final answer
    x = 347.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.