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Finding the Fourth Proportional to 211.91, 317.87 and 143.57

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Solution

The fourth proportional to 211.91, 317.87 and 143.57 is: 215.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.91 : 317.87 = 143.57 : x
  2. Step 2: Convert to fraction form
    211.91/317.87 = 143.57/x
  3. Step 3: Cross multiply
    211.91x = 317.87 × 143.57
  4. Step 4: Simplify right side
    211.91x = 45,634.29
  5. Step 5: Solve for x
    x = 45,634.29/211.91
  6. Step 6: Final answer
    x = 215.35

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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.