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Finding the Fourth Proportional to 114.96, 172.21 and 69.17

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Solution

The fourth proportional to 114.96, 172.21 and 69.17 is: 103.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.96 : 172.21 = 69.17 : x
  2. Step 2: Convert to fraction form
    114.96/172.21 = 69.17/x
  3. Step 3: Cross multiply
    114.96x = 172.21 × 69.17
  4. Step 4: Simplify right side
    114.96x = 11,911.77
  5. Step 5: Solve for x
    x = 11,911.77/114.96
  6. Step 6: Final answer
    x = 103.62

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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.