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Finding the Fourth Proportional to 187.74, 258.66 and 138.54

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Solution

The fourth proportional to 187.74, 258.66 and 138.54 is: 190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.74 : 258.66 = 138.54 : x
  2. Step 2: Convert to fraction form
    187.74/258.66 = 138.54/x
  3. Step 3: Cross multiply
    187.74x = 258.66 × 138.54
  4. Step 4: Simplify right side
    187.74x = 35,834.76
  5. Step 5: Solve for x
    x = 35,834.76/187.74
  6. Step 6: Final answer
    x = 190.87

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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.