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Finding the Fourth Proportional to 139.97, 209.98 and 42.46

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Solution

The fourth proportional to 139.97, 209.98 and 42.46 is: 63.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.97 : 209.98 = 42.46 : x
  2. Step 2: Convert to fraction form
    139.97/209.98 = 42.46/x
  3. Step 3: Cross multiply
    139.97x = 209.98 × 42.46
  4. Step 4: Simplify right side
    139.97x = 8,916.30
  5. Step 5: Solve for x
    x = 8,916.30/139.97
  6. Step 6: Final answer
    x = 63.70

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