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Finding the Fourth Proportional to 211.35, 317.05 and 74.43

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Solution

The fourth proportional to 211.35, 317.05 and 74.43 is: 111.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.35 : 317.05 = 74.43 : x
  2. Step 2: Convert to fraction form
    211.35/317.05 = 74.43/x
  3. Step 3: Cross multiply
    211.35x = 317.05 × 74.43
  4. Step 4: Simplify right side
    211.35x = 23,598.03
  5. Step 5: Solve for x
    x = 23,598.03/211.35
  6. Step 6: Final answer
    x = 111.65

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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.