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Finding the Fourth Proportional to 119.43, 178.78 and 65.16

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Solution

The fourth proportional to 119.43, 178.78 and 65.16 is: 97.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.43 : 178.78 = 65.16 : x
  2. Step 2: Convert to fraction form
    119.43/178.78 = 65.16/x
  3. Step 3: Cross multiply
    119.43x = 178.78 × 65.16
  4. Step 4: Simplify right side
    119.43x = 11,649.30
  5. Step 5: Solve for x
    x = 11,649.30/119.43
  6. Step 6: Final answer
    x = 97.54

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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.