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Finding the Fourth Proportional to 211.15, 317.23 and 199.49

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Solution

The fourth proportional to 211.15, 317.23 and 199.49 is: 299.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.15 : 317.23 = 199.49 : x
  2. Step 2: Convert to fraction form
    211.15/317.23 = 199.49/x
  3. Step 3: Cross multiply
    211.15x = 317.23 × 199.49
  4. Step 4: Simplify right side
    211.15x = 63,284.21
  5. Step 5: Solve for x
    x = 63,284.21/211.15
  6. Step 6: Final answer
    x = 299.72

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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.