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Finding the Fourth Proportional to 189.96, 284.57 and 87.11

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Solution

The fourth proportional to 189.96, 284.57 and 87.11 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.96 : 284.57 = 87.11 : x
  2. Step 2: Convert to fraction form
    189.96/284.57 = 87.11/x
  3. Step 3: Cross multiply
    189.96x = 284.57 × 87.11
  4. Step 4: Simplify right side
    189.96x = 24,787.57
  5. Step 5: Solve for x
    x = 24,787.57/189.96
  6. Step 6: Final answer
    x = 130.49

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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.