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Finding the Fourth Proportional to 120.58, 166.46 and 81.30

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Solution

The fourth proportional to 120.58, 166.46 and 81.30 is: 112.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.58 : 166.46 = 81.30 : x
  2. Step 2: Convert to fraction form
    120.58/166.46 = 81.30/x
  3. Step 3: Cross multiply
    120.58x = 166.46 × 81.30
  4. Step 4: Simplify right side
    120.58x = 13,533.20
  5. Step 5: Solve for x
    x = 13,533.20/120.58
  6. Step 6: Final answer
    x = 112.24

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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.