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Finding the Fourth Proportional to 115, 158.65 and 70.74

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Solution

The fourth proportional to 115, 158.65 and 70.74 is: 97.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    115 : 158.65 = 70.74 : x
  2. Step 2: Convert to fraction form
    115/158.65 = 70.74/x
  3. Step 3: Cross multiply
    115x = 158.65 × 70.74
  4. Step 4: Simplify right side
    115x = 11,222.90
  5. Step 5: Solve for x
    x = 11,222.90/115
  6. Step 6: Final answer
    x = 97.59

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