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Finding the Fourth Proportional to 235.15, 352.73 and 81.06

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Solution

The fourth proportional to 235.15, 352.73 and 81.06 is: 121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.15 : 352.73 = 81.06 : x
  2. Step 2: Convert to fraction form
    235.15/352.73 = 81.06/x
  3. Step 3: Cross multiply
    235.15x = 352.73 × 81.06
  4. Step 4: Simplify right side
    235.15x = 28,592.29
  5. Step 5: Solve for x
    x = 28,592.29/235.15
  6. Step 6: Final answer
    x = 121.59

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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.