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Finding the Fourth Proportional to 120.66, 166.51 and 71.58

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Solution

The fourth proportional to 120.66, 166.51 and 71.58 is: 98.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.66 : 166.51 = 71.58 : x
  2. Step 2: Convert to fraction form
    120.66/166.51 = 71.58/x
  3. Step 3: Cross multiply
    120.66x = 166.51 × 71.58
  4. Step 4: Simplify right side
    120.66x = 11,917.69
  5. Step 5: Solve for x
    x = 11,917.69/120.66
  6. Step 6: Final answer
    x = 98.77

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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.