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Finding the Fourth Proportional to 629.85, 943.69 and 486.21

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Solution

The fourth proportional to 629.85, 943.69 and 486.21 is: 728.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.85 : 943.69 = 486.21 : x
  2. Step 2: Convert to fraction form
    629.85/943.69 = 486.21/x
  3. Step 3: Cross multiply
    629.85x = 943.69 × 486.21
  4. Step 4: Simplify right side
    629.85x = 458,831.51
  5. Step 5: Solve for x
    x = 458,831.51/629.85
  6. Step 6: Final answer
    x = 728.48

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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.