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Finding the Fourth Proportional to 939.85, 1,294.71 and 659.52

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Solution

The fourth proportional to 939.85, 1,294.71 and 659.52 is: 908.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.85 : 1,294.71 = 659.52 : x
  2. Step 2: Convert to fraction form
    939.85/1,294.71 = 659.52/x
  3. Step 3: Cross multiply
    939.85x = 1,294.71 × 659.52
  4. Step 4: Simplify right side
    939.85x = 853,887.14
  5. Step 5: Solve for x
    x = 853,887.14/939.85
  6. Step 6: Final answer
    x = 908.54

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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.