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Finding the Fourth Proportional to 402.44, 555.18 and 255.30

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Solution

The fourth proportional to 402.44, 555.18 and 255.30 is: 352.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.44 : 555.18 = 255.30 : x
  2. Step 2: Convert to fraction form
    402.44/555.18 = 255.30/x
  3. Step 3: Cross multiply
    402.44x = 555.18 × 255.30
  4. Step 4: Simplify right side
    402.44x = 141,737.45
  5. Step 5: Solve for x
    x = 141,737.45/402.44
  6. Step 6: Final answer
    x = 352.20

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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.