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Finding the Fourth Proportional to 235.50, 353.40 and 121.50

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Solution

The fourth proportional to 235.50, 353.40 and 121.50 is: 182.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.50 : 353.40 = 121.50 : x
  2. Step 2: Convert to fraction form
    235.50/353.40 = 121.50/x
  3. Step 3: Cross multiply
    235.50x = 353.40 × 121.50
  4. Step 4: Simplify right side
    235.50x = 42,938.10
  5. Step 5: Solve for x
    x = 42,938.10/235.50
  6. Step 6: Final answer
    x = 182.33

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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.