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Finding the Fourth Proportional to 236.15, 354.24 and 138.80

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Solution

The fourth proportional to 236.15, 354.24 and 138.80 is: 208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.15 : 354.24 = 138.80 : x
  2. Step 2: Convert to fraction form
    236.15/354.24 = 138.80/x
  3. Step 3: Cross multiply
    236.15x = 354.24 × 138.80
  4. Step 4: Simplify right side
    236.15x = 49,166.74
  5. Step 5: Solve for x
    x = 49,166.74/236.15
  6. Step 6: Final answer
    x = 208.21

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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.