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Finding the Fourth Proportional to 178.80, 268.26 and 81.32

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Solution

The fourth proportional to 178.80, 268.26 and 81.32 is: 122.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.80 : 268.26 = 81.32 : x
  2. Step 2: Convert to fraction form
    178.80/268.26 = 81.32/x
  3. Step 3: Cross multiply
    178.80x = 268.26 × 81.32
  4. Step 4: Simplify right side
    178.80x = 21,814.90
  5. Step 5: Solve for x
    x = 21,814.90/178.80
  6. Step 6: Final answer
    x = 122.01

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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.