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Finding the Fourth Proportional to 159.74, 239.62 and 87.74

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Solution

The fourth proportional to 159.74, 239.62 and 87.74 is: 131.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.74 : 239.62 = 87.74 : x
  2. Step 2: Convert to fraction form
    159.74/239.62 = 87.74/x
  3. Step 3: Cross multiply
    159.74x = 239.62 × 87.74
  4. Step 4: Simplify right side
    159.74x = 21,024.26
  5. Step 5: Solve for x
    x = 21,024.26/159.74
  6. Step 6: Final answer
    x = 131.62

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