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Finding the Fourth Proportional to 355.39, 531.78 and 263.32

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Solution

The fourth proportional to 355.39, 531.78 and 263.32 is: 394.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.39 : 531.78 = 263.32 : x
  2. Step 2: Convert to fraction form
    355.39/531.78 = 263.32/x
  3. Step 3: Cross multiply
    355.39x = 531.78 × 263.32
  4. Step 4: Simplify right side
    355.39x = 140,028.31
  5. Step 5: Solve for x
    x = 140,028.31/355.39
  6. Step 6: Final answer
    x = 394.01

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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.