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Finding the Fourth Proportional to 215.50, 297.31 and 136.78

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Solution

The fourth proportional to 215.50, 297.31 and 136.78 is: 188.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.50 : 297.31 = 136.78 : x
  2. Step 2: Convert to fraction form
    215.50/297.31 = 136.78/x
  3. Step 3: Cross multiply
    215.50x = 297.31 × 136.78
  4. Step 4: Simplify right side
    215.50x = 40,666.06
  5. Step 5: Solve for x
    x = 40,666.06/215.50
  6. Step 6: Final answer
    x = 188.71

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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.