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Finding the Fourth Proportional to 139.74, 192.69 and 102.84

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Solution

The fourth proportional to 139.74, 192.69 and 102.84 is: 141.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.74 : 192.69 = 102.84 : x
  2. Step 2: Convert to fraction form
    139.74/192.69 = 102.84/x
  3. Step 3: Cross multiply
    139.74x = 192.69 × 102.84
  4. Step 4: Simplify right side
    139.74x = 19,816.24
  5. Step 5: Solve for x
    x = 19,816.24/139.74
  6. Step 6: Final answer
    x = 141.81

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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.