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Finding the Fourth Proportional to 629.20, 867.54 and 555.40

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Solution

The fourth proportional to 629.20, 867.54 and 555.40 is: 765.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.20 : 867.54 = 555.40 : x
  2. Step 2: Convert to fraction form
    629.20/867.54 = 555.40/x
  3. Step 3: Cross multiply
    629.20x = 867.54 × 555.40
  4. Step 4: Simplify right side
    629.20x = 481,831.72
  5. Step 5: Solve for x
    x = 481,831.72/629.20
  6. Step 6: Final answer
    x = 765.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.