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Finding the Fourth Proportional to 142.17, 213.26 and 69.11

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Solution

The fourth proportional to 142.17, 213.26 and 69.11 is: 103.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.17 : 213.26 = 69.11 : x
  2. Step 2: Convert to fraction form
    142.17/213.26 = 69.11/x
  3. Step 3: Cross multiply
    142.17x = 213.26 × 69.11
  4. Step 4: Simplify right side
    142.17x = 14,739.10
  5. Step 5: Solve for x
    x = 14,739.10/142.17
  6. Step 6: Final answer
    x = 103.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.