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Finding the Fourth Proportional to 630.50, 945.90 and 219.64

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Solution

The fourth proportional to 630.50, 945.90 and 219.64 is: 329.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.50 : 945.90 = 219.64 : x
  2. Step 2: Convert to fraction form
    630.50/945.90 = 219.64/x
  3. Step 3: Cross multiply
    630.50x = 945.90 × 219.64
  4. Step 4: Simplify right side
    630.50x = 207,756.38
  5. Step 5: Solve for x
    x = 207,756.38/630.50
  6. Step 6: Final answer
    x = 329.51

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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.