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Finding the Fourth Proportional to 187.42, 258.69 and 129.19

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Solution

The fourth proportional to 187.42, 258.69 and 129.19 is: 178.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.42 : 258.69 = 129.19 : x
  2. Step 2: Convert to fraction form
    187.42/258.69 = 129.19/x
  3. Step 3: Cross multiply
    187.42x = 258.69 × 129.19
  4. Step 4: Simplify right side
    187.42x = 33,420.16
  5. Step 5: Solve for x
    x = 33,420.16/187.42
  6. Step 6: Final answer
    x = 178.32

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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.