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Finding the Fourth Proportional to 645.15, 967.62 and 212.25

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Solution

The fourth proportional to 645.15, 967.62 and 212.25 is: 318.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.15 : 967.62 = 212.25 : x
  2. Step 2: Convert to fraction form
    645.15/967.62 = 212.25/x
  3. Step 3: Cross multiply
    645.15x = 967.62 × 212.25
  4. Step 4: Simplify right side
    645.15x = 205,377.35
  5. Step 5: Solve for x
    x = 205,377.35/645.15
  6. Step 6: Final answer
    x = 318.34

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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.