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Finding the Fourth Proportional to 629.64, 939.83 and 547.61

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Solution

The fourth proportional to 629.64, 939.83 and 547.61 is: 817.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.64 : 939.83 = 547.61 : x
  2. Step 2: Convert to fraction form
    629.64/939.83 = 547.61/x
  3. Step 3: Cross multiply
    629.64x = 939.83 × 547.61
  4. Step 4: Simplify right side
    629.64x = 514,652.87
  5. Step 5: Solve for x
    x = 514,652.87/629.64
  6. Step 6: Final answer
    x = 817.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.