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Finding the Fourth Proportional to 120.60, 165.51 and 115.48

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Solution

The fourth proportional to 120.60, 165.51 and 115.48 is: 158.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.60 : 165.51 = 115.48 : x
  2. Step 2: Convert to fraction form
    120.60/165.51 = 115.48/x
  3. Step 3: Cross multiply
    120.60x = 165.51 × 115.48
  4. Step 4: Simplify right side
    120.60x = 19,113.09
  5. Step 5: Solve for x
    x = 19,113.09/120.60
  6. Step 6: Final answer
    x = 158.48

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.