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Finding the Fourth Proportional to 399.29, 550.90 and 275.05

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Solution

The fourth proportional to 399.29, 550.90 and 275.05 is: 379.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.29 : 550.90 = 275.05 : x
  2. Step 2: Convert to fraction form
    399.29/550.90 = 275.05/x
  3. Step 3: Cross multiply
    399.29x = 550.90 × 275.05
  4. Step 4: Simplify right side
    399.29x = 151,523.67
  5. Step 5: Solve for x
    x = 151,523.67/399.29
  6. Step 6: Final answer
    x = 379.49

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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.