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Finding the Fourth Proportional to 187.54, 258.55 and 137.72

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Solution

The fourth proportional to 187.54, 258.55 and 137.72 is: 189.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.54 : 258.55 = 137.72 : x
  2. Step 2: Convert to fraction form
    187.54/258.55 = 137.72/x
  3. Step 3: Cross multiply
    187.54x = 258.55 × 137.72
  4. Step 4: Simplify right side
    187.54x = 35,607.81
  5. Step 5: Solve for x
    x = 35,607.81/187.54
  6. Step 6: Final answer
    x = 189.87

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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.