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Finding the Fourth Proportional to 235.57, 353.15 and 91.39

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Solution

The fourth proportional to 235.57, 353.15 and 91.39 is: 137.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.57 : 353.15 = 91.39 : x
  2. Step 2: Convert to fraction form
    235.57/353.15 = 91.39/x
  3. Step 3: Cross multiply
    235.57x = 353.15 × 91.39
  4. Step 4: Simplify right side
    235.57x = 32,274.61
  5. Step 5: Solve for x
    x = 32,274.61/235.57
  6. Step 6: Final answer
    x = 137.01

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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.