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Finding the Fourth Proportional to 98.16, 147.10 and 87.81

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Solution

The fourth proportional to 98.16, 147.10 and 87.81 is: 131.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.16 : 147.10 = 87.81 : x
  2. Step 2: Convert to fraction form
    98.16/147.10 = 87.81/x
  3. Step 3: Cross multiply
    98.16x = 147.10 × 87.81
  4. Step 4: Simplify right side
    98.16x = 12,916.47
  5. Step 5: Solve for x
    x = 12,916.47/98.16
  6. Step 6: Final answer
    x = 131.59

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