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Finding the Fourth Proportional to 210.36, 315.46 and 80.39

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Solution

The fourth proportional to 210.36, 315.46 and 80.39 is: 120.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.36 : 315.46 = 80.39 : x
  2. Step 2: Convert to fraction form
    210.36/315.46 = 80.39/x
  3. Step 3: Cross multiply
    210.36x = 315.46 × 80.39
  4. Step 4: Simplify right side
    210.36x = 25,360.72
  5. Step 5: Solve for x
    x = 25,360.72/210.36
  6. Step 6: Final answer
    x = 120.56

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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.