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Finding the Fourth Proportional to 188.28, 260 and 129.28

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Solution

The fourth proportional to 188.28, 260 and 129.28 is: 178.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.28 : 260 = 129.28 : x
  2. Step 2: Convert to fraction form
    188.28/260 = 129.28/x
  3. Step 3: Cross multiply
    188.28x = 260 × 129.28
  4. Step 4: Simplify right side
    188.28x = 33,612.80
  5. Step 5: Solve for x
    x = 33,612.80/188.28
  6. Step 6: Final answer
    x = 178.53

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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.