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Finding the Fourth Proportional to 402.64, 555.36 and 255.31

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Solution

The fourth proportional to 402.64, 555.36 and 255.31 is: 352.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.64 : 555.36 = 255.31 : x
  2. Step 2: Convert to fraction form
    402.64/555.36 = 255.31/x
  3. Step 3: Cross multiply
    402.64x = 555.36 × 255.31
  4. Step 4: Simplify right side
    402.64x = 141,788.96
  5. Step 5: Solve for x
    x = 141,788.96/402.64
  6. Step 6: Final answer
    x = 352.15

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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.