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Finding the Fourth Proportional to 210.21, 315.09 and 133.23

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Solution

The fourth proportional to 210.21, 315.09 and 133.23 is: 199.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.21 : 315.09 = 133.23 : x
  2. Step 2: Convert to fraction form
    210.21/315.09 = 133.23/x
  3. Step 3: Cross multiply
    210.21x = 315.09 × 133.23
  4. Step 4: Simplify right side
    210.21x = 41,979.44
  5. Step 5: Solve for x
    x = 41,979.44/210.21
  6. Step 6: Final answer
    x = 199.70

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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.