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Finding the Fourth Proportional to 135.46, 202.85 and 86.56

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Solution

The fourth proportional to 135.46, 202.85 and 86.56 is: 129.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.46 : 202.85 = 86.56 : x
  2. Step 2: Convert to fraction form
    135.46/202.85 = 86.56/x
  3. Step 3: Cross multiply
    135.46x = 202.85 × 86.56
  4. Step 4: Simplify right side
    135.46x = 17,558.70
  5. Step 5: Solve for x
    x = 17,558.70/135.46
  6. Step 6: Final answer
    x = 129.62

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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.