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Finding the Fourth Proportional to 210.52, 315.96 and 80.64

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Solution

The fourth proportional to 210.52, 315.96 and 80.64 is: 121.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.52 : 315.96 = 80.64 : x
  2. Step 2: Convert to fraction form
    210.52/315.96 = 80.64/x
  3. Step 3: Cross multiply
    210.52x = 315.96 × 80.64
  4. Step 4: Simplify right side
    210.52x = 25,479.01
  5. Step 5: Solve for x
    x = 25,479.01/210.52
  6. Step 6: Final answer
    x = 121.03

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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.