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Finding the Fourth Proportional to 210.37, 315.50 and 80.38

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Solution

The fourth proportional to 210.37, 315.50 and 80.38 is: 120.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.37 : 315.50 = 80.38 : x
  2. Step 2: Convert to fraction form
    210.37/315.50 = 80.38/x
  3. Step 3: Cross multiply
    210.37x = 315.50 × 80.38
  4. Step 4: Simplify right side
    210.37x = 25,359.89
  5. Step 5: Solve for x
    x = 25,359.89/210.37
  6. Step 6: Final answer
    x = 120.55

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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.