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Finding the Fourth Proportional to 402.93, 555.96 and 255.61

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Solution

The fourth proportional to 402.93, 555.96 and 255.61 is: 352.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.93 : 555.96 = 255.61 : x
  2. Step 2: Convert to fraction form
    402.93/555.96 = 255.61/x
  3. Step 3: Cross multiply
    402.93x = 555.96 × 255.61
  4. Step 4: Simplify right side
    402.93x = 142,104.88
  5. Step 5: Solve for x
    x = 142,104.88/402.93
  6. Step 6: Final answer
    x = 352.68

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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.