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Finding the Fourth Proportional to 140.71, 210.81 and 108.21

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Solution

The fourth proportional to 140.71, 210.81 and 108.21 is: 162.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.71 : 210.81 = 108.21 : x
  2. Step 2: Convert to fraction form
    140.71/210.81 = 108.21/x
  3. Step 3: Cross multiply
    140.71x = 210.81 × 108.21
  4. Step 4: Simplify right side
    140.71x = 22,811.75
  5. Step 5: Solve for x
    x = 22,811.75/140.71
  6. Step 6: Final answer
    x = 162.12

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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.