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Finding the Fourth Proportional to 211.43, 317.20 and 74.48

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Solution

The fourth proportional to 211.43, 317.20 and 74.48 is: 111.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.43 : 317.20 = 74.48 : x
  2. Step 2: Convert to fraction form
    211.43/317.20 = 74.48/x
  3. Step 3: Cross multiply
    211.43x = 317.20 × 74.48
  4. Step 4: Simplify right side
    211.43x = 23,623.10
  5. Step 5: Solve for x
    x = 23,623.10/211.43
  6. Step 6: Final answer
    x = 111.73

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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.