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Finding the Fourth Proportional to 187.20, 258.30 and 128.94

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Solution

The fourth proportional to 187.20, 258.30 and 128.94 is: 177.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.20 : 258.30 = 128.94 : x
  2. Step 2: Convert to fraction form
    187.20/258.30 = 128.94/x
  3. Step 3: Cross multiply
    187.20x = 258.30 × 128.94
  4. Step 4: Simplify right side
    187.20x = 33,305.20
  5. Step 5: Solve for x
    x = 33,305.20/187.20
  6. Step 6: Final answer
    x = 177.91

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.