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Finding the Fourth Proportional to 187.60, 258.88 and 118.56

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Solution

The fourth proportional to 187.60, 258.88 and 118.56 is: 163.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.60 : 258.88 = 118.56 : x
  2. Step 2: Convert to fraction form
    187.60/258.88 = 118.56/x
  3. Step 3: Cross multiply
    187.60x = 258.88 × 118.56
  4. Step 4: Simplify right side
    187.60x = 30,692.81
  5. Step 5: Solve for x
    x = 30,692.81/187.60
  6. Step 6: Final answer
    x = 163.61

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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.