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Finding the Fourth Proportional to 402.20, 553.74 and 339.86

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Solution

The fourth proportional to 402.20, 553.74 and 339.86 is: 467.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.20 : 553.74 = 339.86 : x
  2. Step 2: Convert to fraction form
    402.20/553.74 = 339.86/x
  3. Step 3: Cross multiply
    402.20x = 553.74 × 339.86
  4. Step 4: Simplify right side
    402.20x = 188,194.19
  5. Step 5: Solve for x
    x = 188,194.19/402.20
  6. Step 6: Final answer
    x = 467.91

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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.