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Finding the Fourth Proportional to 188.47, 259.74 and 129.48

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Solution

The fourth proportional to 188.47, 259.74 and 129.48 is: 178.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.47 : 259.74 = 129.48 : x
  2. Step 2: Convert to fraction form
    188.47/259.74 = 129.48/x
  3. Step 3: Cross multiply
    188.47x = 259.74 × 129.48
  4. Step 4: Simplify right side
    188.47x = 33,630.16
  5. Step 5: Solve for x
    x = 33,630.16/188.47
  6. Step 6: Final answer
    x = 178.44

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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.