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Finding the Fourth Proportional to 134.72, 202.07 and 80.57

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Solution

The fourth proportional to 134.72, 202.07 and 80.57 is: 120.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.72 : 202.07 = 80.57 : x
  2. Step 2: Convert to fraction form
    134.72/202.07 = 80.57/x
  3. Step 3: Cross multiply
    134.72x = 202.07 × 80.57
  4. Step 4: Simplify right side
    134.72x = 16,279.37
  5. Step 5: Solve for x
    x = 16,279.37/134.72
  6. Step 6: Final answer
    x = 120.84

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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.