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Finding the Fourth Proportional to 189.96, 285 and 135.24

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Solution

The fourth proportional to 189.96, 285 and 135.24 is: 202.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.96 : 285 = 135.24 : x
  2. Step 2: Convert to fraction form
    189.96/285 = 135.24/x
  3. Step 3: Cross multiply
    189.96x = 285 × 135.24
  4. Step 4: Simplify right side
    189.96x = 38,543.40
  5. Step 5: Solve for x
    x = 38,543.40/189.96
  6. Step 6: Final answer
    x = 202.90

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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.