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Finding the Fourth Proportional to 629.76, 945.20 and 305.28

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Solution

The fourth proportional to 629.76, 945.20 and 305.28 is: 458.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.76 : 945.20 = 305.28 : x
  2. Step 2: Convert to fraction form
    629.76/945.20 = 305.28/x
  3. Step 3: Cross multiply
    629.76x = 945.20 × 305.28
  4. Step 4: Simplify right side
    629.76x = 288,550.66
  5. Step 5: Solve for x
    x = 288,550.66/629.76
  6. Step 6: Final answer
    x = 458.19

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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.