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Finding the Fourth Proportional to 119.81, 165.30 and 76.14

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Solution

The fourth proportional to 119.81, 165.30 and 76.14 is: 105.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.81 : 165.30 = 76.14 : x
  2. Step 2: Convert to fraction form
    119.81/165.30 = 76.14/x
  3. Step 3: Cross multiply
    119.81x = 165.30 × 76.14
  4. Step 4: Simplify right side
    119.81x = 12,585.94
  5. Step 5: Solve for x
    x = 12,585.94/119.81
  6. Step 6: Final answer
    x = 105.05

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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.