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Finding the Fourth Proportional to 113.62, 170.16 and 86.35

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Solution

The fourth proportional to 113.62, 170.16 and 86.35 is: 129.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.62 : 170.16 = 86.35 : x
  2. Step 2: Convert to fraction form
    113.62/170.16 = 86.35/x
  3. Step 3: Cross multiply
    113.62x = 170.16 × 86.35
  4. Step 4: Simplify right side
    113.62x = 14,693.32
  5. Step 5: Solve for x
    x = 14,693.32/113.62
  6. Step 6: Final answer
    x = 129.32

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