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Finding the Fourth Proportional to 402.39, 555.39 and 336.78

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Solution

The fourth proportional to 402.39, 555.39 and 336.78 is: 464.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.39 : 555.39 = 336.78 : x
  2. Step 2: Convert to fraction form
    402.39/555.39 = 336.78/x
  3. Step 3: Cross multiply
    402.39x = 555.39 × 336.78
  4. Step 4: Simplify right side
    402.39x = 187,044.24
  5. Step 5: Solve for x
    x = 187,044.24/402.39
  6. Step 6: Final answer
    x = 464.83

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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.