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Finding the Fourth Proportional to 353.60, 486.96 and 255.20

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Solution

The fourth proportional to 353.60, 486.96 and 255.20 is: 351.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.60 : 486.96 = 255.20 : x
  2. Step 2: Convert to fraction form
    353.60/486.96 = 255.20/x
  3. Step 3: Cross multiply
    353.60x = 486.96 × 255.20
  4. Step 4: Simplify right side
    353.60x = 124,272.19
  5. Step 5: Solve for x
    x = 124,272.19/353.60
  6. Step 6: Final answer
    x = 351.45

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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.