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Finding the Fourth Proportional to 178.86, 268.30 and 81.26

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Solution

The fourth proportional to 178.86, 268.30 and 81.26 is: 121.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.86 : 268.30 = 81.26 : x
  2. Step 2: Convert to fraction form
    178.86/268.30 = 81.26/x
  3. Step 3: Cross multiply
    178.86x = 268.30 × 81.26
  4. Step 4: Simplify right side
    178.86x = 21,802.06
  5. Step 5: Solve for x
    x = 21,802.06/178.86
  6. Step 6: Final answer
    x = 121.89

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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.