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Finding the Fourth Proportional to 211.67, 317.10 and 211.40

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Solution

The fourth proportional to 211.67, 317.10 and 211.40 is: 316.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.67 : 317.10 = 211.40 : x
  2. Step 2: Convert to fraction form
    211.67/317.10 = 211.40/x
  3. Step 3: Cross multiply
    211.67x = 317.10 × 211.40
  4. Step 4: Simplify right side
    211.67x = 67,034.94
  5. Step 5: Solve for x
    x = 67,034.94/211.67
  6. Step 6: Final answer
    x = 316.70

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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.