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Finding the Fourth Proportional to 211.87, 317.80 and 103.63

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Solution

The fourth proportional to 211.87, 317.80 and 103.63 is: 155.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.87 : 317.80 = 103.63 : x
  2. Step 2: Convert to fraction form
    211.87/317.80 = 103.63/x
  3. Step 3: Cross multiply
    211.87x = 317.80 × 103.63
  4. Step 4: Simplify right side
    211.87x = 32,932.03
  5. Step 5: Solve for x
    x = 32,932.03/211.87
  6. Step 6: Final answer
    x = 155.44

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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.