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Finding the Fourth Proportional to 210.92, 316.32 and 80.92

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Solution

The fourth proportional to 210.92, 316.32 and 80.92 is: 121.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.92 : 316.32 = 80.92 : x
  2. Step 2: Convert to fraction form
    210.92/316.32 = 80.92/x
  3. Step 3: Cross multiply
    210.92x = 316.32 × 80.92
  4. Step 4: Simplify right side
    210.92x = 25,596.61
  5. Step 5: Solve for x
    x = 25,596.61/210.92
  6. Step 6: Final answer
    x = 121.36

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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.