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Finding the Fourth Proportional to 629.45, 869.72 and 607.28

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Solution

The fourth proportional to 629.45, 869.72 and 607.28 is: 839.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.45 : 869.72 = 607.28 : x
  2. Step 2: Convert to fraction form
    629.45/869.72 = 607.28/x
  3. Step 3: Cross multiply
    629.45x = 869.72 × 607.28
  4. Step 4: Simplify right side
    629.45x = 528,163.56
  5. Step 5: Solve for x
    x = 528,163.56/629.45
  6. Step 6: Final answer
    x = 839.09

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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.