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Finding the Fourth Proportional to 939.25, 1,296.31 and 561.19

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Solution

The fourth proportional to 939.25, 1,296.31 and 561.19 is: 774.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.25 : 1,296.31 = 561.19 : x
  2. Step 2: Convert to fraction form
    939.25/1,296.31 = 561.19/x
  3. Step 3: Cross multiply
    939.25x = 1,296.31 × 561.19
  4. Step 4: Simplify right side
    939.25x = 727,476.21
  5. Step 5: Solve for x
    x = 727,476.21/939.25
  6. Step 6: Final answer
    x = 774.53

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Double scale
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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.