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Finding the Fourth Proportional to 1,029.38, 1,544.63 and 639.59

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Solution

The fourth proportional to 1,029.38, 1,544.63 and 639.59 is: 959.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.38 : 1,544.63 = 639.59 : x
  2. Step 2: Convert to fraction form
    1,029.38/1,544.63 = 639.59/x
  3. Step 3: Cross multiply
    1,029.38x = 1,544.63 × 639.59
  4. Step 4: Simplify right side
    1,029.38x = 987,918.98
  5. Step 5: Solve for x
    x = 987,918.98/1,029.38
  6. Step 6: Final answer
    x = 959.73

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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.