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Finding the Fourth Proportional to 139.62, 192.63 and 102.87

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Solution

The fourth proportional to 139.62, 192.63 and 102.87 is: 141.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.62 : 192.63 = 102.87 : x
  2. Step 2: Convert to fraction form
    139.62/192.63 = 102.87/x
  3. Step 3: Cross multiply
    139.62x = 192.63 × 102.87
  4. Step 4: Simplify right side
    139.62x = 19,815.66
  5. Step 5: Solve for x
    x = 19,815.66/139.62
  6. Step 6: Final answer
    x = 141.92

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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.