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Finding the Fourth Proportional to 189.81, 261.86 and 143.28

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Solution

The fourth proportional to 189.81, 261.86 and 143.28 is: 197.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.81 : 261.86 = 143.28 : x
  2. Step 2: Convert to fraction form
    189.81/261.86 = 143.28/x
  3. Step 3: Cross multiply
    189.81x = 261.86 × 143.28
  4. Step 4: Simplify right side
    189.81x = 37,518.58
  5. Step 5: Solve for x
    x = 37,518.58/189.81
  6. Step 6: Final answer
    x = 197.66

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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.