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Finding the Fourth Proportional to 939.90, 1,295.69 and 659.29

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Solution

The fourth proportional to 939.90, 1,295.69 and 659.29 is: 908.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.90 : 1,295.69 = 659.29 : x
  2. Step 2: Convert to fraction form
    939.90/1,295.69 = 659.29/x
  3. Step 3: Cross multiply
    939.90x = 1,295.69 × 659.29
  4. Step 4: Simplify right side
    939.90x = 854,235.46
  5. Step 5: Solve for x
    x = 854,235.46/939.90
  6. Step 6: Final answer
    x = 908.86

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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.