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Finding the Fourth Proportional to 355.15, 531.74 and 268.22

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Solution

The fourth proportional to 355.15, 531.74 and 268.22 is: 401.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.15 : 531.74 = 268.22 : x
  2. Step 2: Convert to fraction form
    355.15/531.74 = 268.22/x
  3. Step 3: Cross multiply
    355.15x = 531.74 × 268.22
  4. Step 4: Simplify right side
    355.15x = 142,623.30
  5. Step 5: Solve for x
    x = 142,623.30/355.15
  6. Step 6: Final answer
    x = 401.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.