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Finding the Fourth Proportional to 186.72, 258.12 and 154.32

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Solution

The fourth proportional to 186.72, 258.12 and 154.32 is: 213.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.72 : 258.12 = 154.32 : x
  2. Step 2: Convert to fraction form
    186.72/258.12 = 154.32/x
  3. Step 3: Cross multiply
    186.72x = 258.12 × 154.32
  4. Step 4: Simplify right side
    186.72x = 39,833.08
  5. Step 5: Solve for x
    x = 39,833.08/186.72
  6. Step 6: Final answer
    x = 213.33

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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.