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Finding the Fourth Proportional to 119.76, 165.06 and 111.66

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Solution

The fourth proportional to 119.76, 165.06 and 111.66 is: 153.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.76 : 165.06 = 111.66 : x
  2. Step 2: Convert to fraction form
    119.76/165.06 = 111.66/x
  3. Step 3: Cross multiply
    119.76x = 165.06 × 111.66
  4. Step 4: Simplify right side
    119.76x = 18,430.60
  5. Step 5: Solve for x
    x = 18,430.60/119.76
  6. Step 6: Final answer
    x = 153.90

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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.