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Finding the Fourth Proportional to 140.36, 210.46 and 71.85

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Solution

The fourth proportional to 140.36, 210.46 and 71.85 is: 107.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.36 : 210.46 = 71.85 : x
  2. Step 2: Convert to fraction form
    140.36/210.46 = 71.85/x
  3. Step 3: Cross multiply
    140.36x = 210.46 × 71.85
  4. Step 4: Simplify right side
    140.36x = 15,121.55
  5. Step 5: Solve for x
    x = 15,121.55/140.36
  6. Step 6: Final answer
    x = 107.73

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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.