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Finding the Fourth Proportional to 629.80, 945.24 and 412.72

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Solution

The fourth proportional to 629.80, 945.24 and 412.72 is: 619.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.80 : 945.24 = 412.72 : x
  2. Step 2: Convert to fraction form
    629.80/945.24 = 412.72/x
  3. Step 3: Cross multiply
    629.80x = 945.24 × 412.72
  4. Step 4: Simplify right side
    629.80x = 390,119.45
  5. Step 5: Solve for x
    x = 390,119.45/629.80
  6. Step 6: Final answer
    x = 619.43

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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.