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Finding the Fourth Proportional to 155.25, 213.54 and 136.79

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Solution

The fourth proportional to 155.25, 213.54 and 136.79 is: 188.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.25 : 213.54 = 136.79 : x
  2. Step 2: Convert to fraction form
    155.25/213.54 = 136.79/x
  3. Step 3: Cross multiply
    155.25x = 213.54 × 136.79
  4. Step 4: Simplify right side
    155.25x = 29,209.36
  5. Step 5: Solve for x
    x = 29,209.36/155.25
  6. Step 6: Final answer
    x = 188.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.