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Finding the Fourth Proportional to 188.68, 260.04 and 129.55

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Solution

The fourth proportional to 188.68, 260.04 and 129.55 is: 178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.68 : 260.04 = 129.55 : x
  2. Step 2: Convert to fraction form
    188.68/260.04 = 129.55/x
  3. Step 3: Cross multiply
    188.68x = 260.04 × 129.55
  4. Step 4: Simplify right side
    188.68x = 33,688.18
  5. Step 5: Solve for x
    x = 33,688.18/188.68
  6. Step 6: Final answer
    x = 178.55

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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.