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Finding the Fourth Proportional to 629.56, 862.13 and 627.40

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Solution

The fourth proportional to 629.56, 862.13 and 627.40 is: 859.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.56 : 862.13 = 627.40 : x
  2. Step 2: Convert to fraction form
    629.56/862.13 = 627.40/x
  3. Step 3: Cross multiply
    629.56x = 862.13 × 627.40
  4. Step 4: Simplify right side
    629.56x = 540,900.36
  5. Step 5: Solve for x
    x = 540,900.36/629.56
  6. Step 6: Final answer
    x = 859.17

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.