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Finding the Fourth Proportional to 211.45, 317.18 and 74.47

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Solution

The fourth proportional to 211.45, 317.18 and 74.47 is: 111.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.45 : 317.18 = 74.47 : x
  2. Step 2: Convert to fraction form
    211.45/317.18 = 74.47/x
  3. Step 3: Cross multiply
    211.45x = 317.18 × 74.47
  4. Step 4: Simplify right side
    211.45x = 23,620.39
  5. Step 5: Solve for x
    x = 23,620.39/211.45
  6. Step 6: Final answer
    x = 111.71

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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.