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Finding the Fourth Proportional to 189.97, 261.90 and 145.78

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Solution

The fourth proportional to 189.97, 261.90 and 145.78 is: 200.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.97 : 261.90 = 145.78 : x
  2. Step 2: Convert to fraction form
    189.97/261.90 = 145.78/x
  3. Step 3: Cross multiply
    189.97x = 261.90 × 145.78
  4. Step 4: Simplify right side
    189.97x = 38,179.13
  5. Step 5: Solve for x
    x = 38,179.13/189.97
  6. Step 6: Final answer
    x = 200.98

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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.