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Finding the Fourth Proportional to 142.85, 214.21 and 69.73

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Solution

The fourth proportional to 142.85, 214.21 and 69.73 is: 104.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.85 : 214.21 = 69.73 : x
  2. Step 2: Convert to fraction form
    142.85/214.21 = 69.73/x
  3. Step 3: Cross multiply
    142.85x = 214.21 × 69.73
  4. Step 4: Simplify right side
    142.85x = 14,936.51
  5. Step 5: Solve for x
    x = 14,936.51/142.85
  6. Step 6: Final answer
    x = 104.56

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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.