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Finding the Fourth Proportional to 187.72, 258.42 and 154.58

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Solution

The fourth proportional to 187.72, 258.42 and 154.58 is: 212.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.72 : 258.42 = 154.58 : x
  2. Step 2: Convert to fraction form
    187.72/258.42 = 154.58/x
  3. Step 3: Cross multiply
    187.72x = 258.42 × 154.58
  4. Step 4: Simplify right side
    187.72x = 39,945.85
  5. Step 5: Solve for x
    x = 39,945.85/187.72
  6. Step 6: Final answer
    x = 212.80

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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.