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Finding the Fourth Proportional to 140.35, 210.34 and 71.81

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Solution

The fourth proportional to 140.35, 210.34 and 71.81 is: 107.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.35 : 210.34 = 71.81 : x
  2. Step 2: Convert to fraction form
    140.35/210.34 = 71.81/x
  3. Step 3: Cross multiply
    140.35x = 210.34 × 71.81
  4. Step 4: Simplify right side
    140.35x = 15,104.16
  5. Step 5: Solve for x
    x = 15,104.16/140.35
  6. Step 6: Final answer
    x = 107.62

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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.