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Finding the Fourth Proportional to 399.90, 552.12 and 252.75

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Solution

The fourth proportional to 399.90, 552.12 and 252.75 is: 348.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.90 : 552.12 = 252.75 : x
  2. Step 2: Convert to fraction form
    399.90/552.12 = 252.75/x
  3. Step 3: Cross multiply
    399.90x = 552.12 × 252.75
  4. Step 4: Simplify right side
    399.90x = 139,549.45
  5. Step 5: Solve for x
    x = 139,549.45/399.90
  6. Step 6: Final answer
    x = 348.96

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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.