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Finding the Fourth Proportional to 139.64, 192.44 and 120.20

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Solution

The fourth proportional to 139.64, 192.44 and 120.20 is: 165.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.64 : 192.44 = 120.20 : x
  2. Step 2: Convert to fraction form
    139.64/192.44 = 120.20/x
  3. Step 3: Cross multiply
    139.64x = 192.44 × 120.20
  4. Step 4: Simplify right side
    139.64x = 23,130.63
  5. Step 5: Solve for x
    x = 23,130.63/139.64
  6. Step 6: Final answer
    x = 165.65

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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.