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Finding the Fourth Proportional to 210.09, 314.95 and 81.75

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Solution

The fourth proportional to 210.09, 314.95 and 81.75 is: 122.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.09 : 314.95 = 81.75 : x
  2. Step 2: Convert to fraction form
    210.09/314.95 = 81.75/x
  3. Step 3: Cross multiply
    210.09x = 314.95 × 81.75
  4. Step 4: Simplify right side
    210.09x = 25,747.16
  5. Step 5: Solve for x
    x = 25,747.16/210.09
  6. Step 6: Final answer
    x = 122.55

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