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Finding the Fourth Proportional to 235.80, 355.20 and 203.40

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Solution

The fourth proportional to 235.80, 355.20 and 203.40 is: 306.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.80 : 355.20 = 203.40 : x
  2. Step 2: Convert to fraction form
    235.80/355.20 = 203.40/x
  3. Step 3: Cross multiply
    235.80x = 355.20 × 203.40
  4. Step 4: Simplify right side
    235.80x = 72,247.68
  5. Step 5: Solve for x
    x = 72,247.68/235.80
  6. Step 6: Final answer
    x = 306.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.