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Finding the Fourth Proportional to 12.40, 18.62 and 9.74

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Solution

The fourth proportional to 12.40, 18.62 and 9.74 is: 14.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.40 : 18.62 = 9.74 : x
  2. Step 2: Convert to fraction form
    12.40/18.62 = 9.74/x
  3. Step 3: Cross multiply
    12.40x = 18.62 × 9.74
  4. Step 4: Simplify right side
    12.40x = 181.36
  5. Step 5: Solve for x
    x = 181.36/12.40
  6. Step 6: Final answer
    x = 14.63

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