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Finding the Fourth Proportional to 186.81, 257.43 and 145.34

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Solution

The fourth proportional to 186.81, 257.43 and 145.34 is: 200.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.81 : 257.43 = 145.34 : x
  2. Step 2: Convert to fraction form
    186.81/257.43 = 145.34/x
  3. Step 3: Cross multiply
    186.81x = 257.43 × 145.34
  4. Step 4: Simplify right side
    186.81x = 37,415.73
  5. Step 5: Solve for x
    x = 37,415.73/186.81
  6. Step 6: Final answer
    x = 200.29

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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.