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Finding the Fourth Proportional to 139.87, 192.94 and 89.31

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Solution

The fourth proportional to 139.87, 192.94 and 89.31 is: 123.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.87 : 192.94 = 89.31 : x
  2. Step 2: Convert to fraction form
    139.87/192.94 = 89.31/x
  3. Step 3: Cross multiply
    139.87x = 192.94 × 89.31
  4. Step 4: Simplify right side
    139.87x = 17,230.73
  5. Step 5: Solve for x
    x = 17,230.73/139.87
  6. Step 6: Final answer
    x = 123.19

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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.