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Finding the Fourth Proportional to 202.57, 303.60 and 91.31

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Solution

The fourth proportional to 202.57, 303.60 and 91.31 is: 136.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.57 : 303.60 = 91.31 : x
  2. Step 2: Convert to fraction form
    202.57/303.60 = 91.31/x
  3. Step 3: Cross multiply
    202.57x = 303.60 × 91.31
  4. Step 4: Simplify right side
    202.57x = 27,721.24
  5. Step 5: Solve for x
    x = 27,721.24/202.57
  6. Step 6: Final answer
    x = 136.84

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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.