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Finding the Fourth Proportional to 186.90, 258.06 and 145.44

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Solution

The fourth proportional to 186.90, 258.06 and 145.44 is: 200.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.90 : 258.06 = 145.44 : x
  2. Step 2: Convert to fraction form
    186.90/258.06 = 145.44/x
  3. Step 3: Cross multiply
    186.90x = 258.06 × 145.44
  4. Step 4: Simplify right side
    186.90x = 37,532.25
  5. Step 5: Solve for x
    x = 37,532.25/186.90
  6. Step 6: Final answer
    x = 200.81

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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.