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Finding the Fourth Proportional to 187.68, 258.99 and 104.78

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Solution

The fourth proportional to 187.68, 258.99 and 104.78 is: 144.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.68 : 258.99 = 104.78 : x
  2. Step 2: Convert to fraction form
    187.68/258.99 = 104.78/x
  3. Step 3: Cross multiply
    187.68x = 258.99 × 104.78
  4. Step 4: Simplify right side
    187.68x = 27,137.62
  5. Step 5: Solve for x
    x = 27,137.62/187.68
  6. Step 6: Final answer
    x = 144.60

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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.