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Finding the Fourth Proportional to 212.28, 317.52 and 208.32

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Solution

The fourth proportional to 212.28, 317.52 and 208.32 is: 311.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.28 : 317.52 = 208.32 : x
  2. Step 2: Convert to fraction form
    212.28/317.52 = 208.32/x
  3. Step 3: Cross multiply
    212.28x = 317.52 × 208.32
  4. Step 4: Simplify right side
    212.28x = 66,145.77
  5. Step 5: Solve for x
    x = 66,145.77/212.28
  6. Step 6: Final answer
    x = 311.60

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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.