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Finding the Fourth Proportional to 1,382.53, 1,906.93 and 939.66

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Solution

The fourth proportional to 1,382.53, 1,906.93 and 939.66 is: 1,296.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.53 : 1,906.93 = 939.66 : x
  2. Step 2: Convert to fraction form
    1,382.53/1,906.93 = 939.66/x
  3. Step 3: Cross multiply
    1,382.53x = 1,906.93 × 939.66
  4. Step 4: Simplify right side
    1,382.53x = 1,791,865.84
  5. Step 5: Solve for x
    x = 1,791,865.84/1,382.53
  6. Step 6: Final answer
    x = 1,296.08

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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.