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Finding the Fourth Proportional to 355.31, 532.88 and 111.79

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Solution

The fourth proportional to 355.31, 532.88 and 111.79 is: 167.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.31 : 532.88 = 111.79 : x
  2. Step 2: Convert to fraction form
    355.31/532.88 = 111.79/x
  3. Step 3: Cross multiply
    355.31x = 532.88 × 111.79
  4. Step 4: Simplify right side
    355.31x = 59,570.66
  5. Step 5: Solve for x
    x = 59,570.66/355.31
  6. Step 6: Final answer
    x = 167.66

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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.