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Finding the Fourth Proportional to 142.87, 214.32 and 70.73

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Solution

The fourth proportional to 142.87, 214.32 and 70.73 is: 106.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.87 : 214.32 = 70.73 : x
  2. Step 2: Convert to fraction form
    142.87/214.32 = 70.73/x
  3. Step 3: Cross multiply
    142.87x = 214.32 × 70.73
  4. Step 4: Simplify right side
    142.87x = 15,158.85
  5. Step 5: Solve for x
    x = 15,158.85/142.87
  6. Step 6: Final answer
    x = 106.10

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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.