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Finding the Fourth Proportional to 235.92, 354 and 91.68

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Solution

The fourth proportional to 235.92, 354 and 91.68 is: 137.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.92 : 354 = 91.68 : x
  2. Step 2: Convert to fraction form
    235.92/354 = 91.68/x
  3. Step 3: Cross multiply
    235.92x = 354 × 91.68
  4. Step 4: Simplify right side
    235.92x = 32,454.72
  5. Step 5: Solve for x
    x = 32,454.72/235.92
  6. Step 6: Final answer
    x = 137.57

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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.