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Finding the Fourth Proportional to 187.28, 258 and 128.96

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Solution

The fourth proportional to 187.28, 258 and 128.96 is: 177.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.28 : 258 = 128.96 : x
  2. Step 2: Convert to fraction form
    187.28/258 = 128.96/x
  3. Step 3: Cross multiply
    187.28x = 258 × 128.96
  4. Step 4: Simplify right side
    187.28x = 33,271.68
  5. Step 5: Solve for x
    x = 33,271.68/187.28
  6. Step 6: Final answer
    x = 177.66

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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.