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Finding the Fourth Proportional to 119.45, 164.81 and 78.02

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Solution

The fourth proportional to 119.45, 164.81 and 78.02 is: 107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.45 : 164.81 = 78.02 : x
  2. Step 2: Convert to fraction form
    119.45/164.81 = 78.02/x
  3. Step 3: Cross multiply
    119.45x = 164.81 × 78.02
  4. Step 4: Simplify right side
    119.45x = 12,858.48
  5. Step 5: Solve for x
    x = 12,858.48/119.45
  6. Step 6: Final answer
    x = 107.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.