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Finding the Fourth Proportional to 187.69, 258.74 and 154.88

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Solution

The fourth proportional to 187.69, 258.74 and 154.88 is: 213.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.69 : 258.74 = 154.88 : x
  2. Step 2: Convert to fraction form
    187.69/258.74 = 154.88/x
  3. Step 3: Cross multiply
    187.69x = 258.74 × 154.88
  4. Step 4: Simplify right side
    187.69x = 40,073.52
  5. Step 5: Solve for x
    x = 40,073.52/187.69
  6. Step 6: Final answer
    x = 213.51

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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.