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Finding the Fourth Proportional to 189.86, 285.08 and 118.17

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Solution

The fourth proportional to 189.86, 285.08 and 118.17 is: 177.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.86 : 285.08 = 118.17 : x
  2. Step 2: Convert to fraction form
    189.86/285.08 = 118.17/x
  3. Step 3: Cross multiply
    189.86x = 285.08 × 118.17
  4. Step 4: Simplify right side
    189.86x = 33,687.31
  5. Step 5: Solve for x
    x = 33,687.31/189.86
  6. Step 6: Final answer
    x = 177.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.