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Finding the Fourth Proportional to 116.12, 159.81 and 102.21

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Solution

The fourth proportional to 116.12, 159.81 and 102.21 is: 140.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.12 : 159.81 = 102.21 : x
  2. Step 2: Convert to fraction form
    116.12/159.81 = 102.21/x
  3. Step 3: Cross multiply
    116.12x = 159.81 × 102.21
  4. Step 4: Simplify right side
    116.12x = 16,334.18
  5. Step 5: Solve for x
    x = 16,334.18/116.12
  6. Step 6: Final answer
    x = 140.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.