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Finding the Fourth Proportional to 187.04, 258.08 and 128.84

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Solution

The fourth proportional to 187.04, 258.08 and 128.84 is: 177.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.04 : 258.08 = 128.84 : x
  2. Step 2: Convert to fraction form
    187.04/258.08 = 128.84/x
  3. Step 3: Cross multiply
    187.04x = 258.08 × 128.84
  4. Step 4: Simplify right side
    187.04x = 33,251.03
  5. Step 5: Solve for x
    x = 33,251.03/187.04
  6. Step 6: Final answer
    x = 177.77

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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.