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Finding the Fourth Proportional to 120.12, 165.72 and 73.47

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Solution

The fourth proportional to 120.12, 165.72 and 73.47 is: 101.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.12 : 165.72 = 73.47 : x
  2. Step 2: Convert to fraction form
    120.12/165.72 = 73.47/x
  3. Step 3: Cross multiply
    120.12x = 165.72 × 73.47
  4. Step 4: Simplify right side
    120.12x = 12,175.45
  5. Step 5: Solve for x
    x = 12,175.45/120.12
  6. Step 6: Final answer
    x = 101.36

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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.