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Finding the Fourth Proportional to 402.90, 555.35 and 255.29

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Solution

The fourth proportional to 402.90, 555.35 and 255.29 is: 351.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.90 : 555.35 = 255.29 : x
  2. Step 2: Convert to fraction form
    402.90/555.35 = 255.29/x
  3. Step 3: Cross multiply
    402.90x = 555.35 × 255.29
  4. Step 4: Simplify right side
    402.90x = 141,771.25
  5. Step 5: Solve for x
    x = 141,771.25/402.90
  6. Step 6: Final answer
    x = 351.88

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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.