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Finding the Fourth Proportional to 119.10, 178.41 and 99.79

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Solution

The fourth proportional to 119.10, 178.41 and 99.79 is: 149.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.10 : 178.41 = 99.79 : x
  2. Step 2: Convert to fraction form
    119.10/178.41 = 99.79/x
  3. Step 3: Cross multiply
    119.10x = 178.41 × 99.79
  4. Step 4: Simplify right side
    119.10x = 17,802.14
  5. Step 5: Solve for x
    x = 17,802.14/119.10
  6. Step 6: Final answer
    x = 149.48

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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.