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Finding the Fourth Proportional to 939.35, 1,296.41 and 561.33

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Solution

The fourth proportional to 939.35, 1,296.41 and 561.33 is: 774.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.35 : 1,296.41 = 561.33 : x
  2. Step 2: Convert to fraction form
    939.35/1,296.41 = 561.33/x
  3. Step 3: Cross multiply
    939.35x = 1,296.41 × 561.33
  4. Step 4: Simplify right side
    939.35x = 727,711.02
  5. Step 5: Solve for x
    x = 727,711.02/939.35
  6. Step 6: Final answer
    x = 774.70

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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.