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Finding the Fourth Proportional to 140.10, 192.81 and 120.66

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Solution

The fourth proportional to 140.10, 192.81 and 120.66 is: 166.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.10 : 192.81 = 120.66 : x
  2. Step 2: Convert to fraction form
    140.10/192.81 = 120.66/x
  3. Step 3: Cross multiply
    140.10x = 192.81 × 120.66
  4. Step 4: Simplify right side
    140.10x = 23,264.45
  5. Step 5: Solve for x
    x = 23,264.45/140.10
  6. Step 6: Final answer
    x = 166.06

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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.