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Finding the Fourth Proportional to 210.62, 315.92 and 80.60

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Solution

The fourth proportional to 210.62, 315.92 and 80.60 is: 120.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.62 : 315.92 = 80.60 : x
  2. Step 2: Convert to fraction form
    210.62/315.92 = 80.60/x
  3. Step 3: Cross multiply
    210.62x = 315.92 × 80.60
  4. Step 4: Simplify right side
    210.62x = 25,464.14
  5. Step 5: Solve for x
    x = 25,464.14/210.62
  6. Step 6: Final answer
    x = 120.90

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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.