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Finding the Fourth Proportional to 119.14, 178.40 and 78.44

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Solution

The fourth proportional to 119.14, 178.40 and 78.44 is: 117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.14 : 178.40 = 78.44 : x
  2. Step 2: Convert to fraction form
    119.14/178.40 = 78.44/x
  3. Step 3: Cross multiply
    119.14x = 178.40 × 78.44
  4. Step 4: Simplify right side
    119.14x = 13,993.00
  5. Step 5: Solve for x
    x = 13,993.00/119.14
  6. Step 6: Final answer
    x = 117.45

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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.