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Finding the Fourth Proportional to 189.96, 284.78 and 87.18

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Solution

The fourth proportional to 189.96, 284.78 and 87.18 is: 130.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.96 : 284.78 = 87.18 : x
  2. Step 2: Convert to fraction form
    189.96/284.78 = 87.18/x
  3. Step 3: Cross multiply
    189.96x = 284.78 × 87.18
  4. Step 4: Simplify right side
    189.96x = 24,827.12
  5. Step 5: Solve for x
    x = 24,827.12/189.96
  6. Step 6: Final answer
    x = 130.70

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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.