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Finding the Fourth Proportional to 186.78, 258.02 and 149.90

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Solution

The fourth proportional to 186.78, 258.02 and 149.90 is: 207.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.78 : 258.02 = 149.90 : x
  2. Step 2: Convert to fraction form
    186.78/258.02 = 149.90/x
  3. Step 3: Cross multiply
    186.78x = 258.02 × 149.90
  4. Step 4: Simplify right side
    186.78x = 38,677.20
  5. Step 5: Solve for x
    x = 38,677.20/186.78
  6. Step 6: Final answer
    x = 207.07

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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.