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Finding the Fourth Proportional to 139.19, 192.12 and 81.01

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Solution

The fourth proportional to 139.19, 192.12 and 81.01 is: 111.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.19 : 192.12 = 81.01 : x
  2. Step 2: Convert to fraction form
    139.19/192.12 = 81.01/x
  3. Step 3: Cross multiply
    139.19x = 192.12 × 81.01
  4. Step 4: Simplify right side
    139.19x = 15,563.64
  5. Step 5: Solve for x
    x = 15,563.64/139.19
  6. Step 6: Final answer
    x = 111.82

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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.