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Finding the Fourth Proportional to 939.84, 1,399.22 and 935.28

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Solution

The fourth proportional to 939.84, 1,399.22 and 935.28 is: 1,392.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.84 : 1,399.22 = 935.28 : x
  2. Step 2: Convert to fraction form
    939.84/1,399.22 = 935.28/x
  3. Step 3: Cross multiply
    939.84x = 1,399.22 × 935.28
  4. Step 4: Simplify right side
    939.84x = 1,308,672.48
  5. Step 5: Solve for x
    x = 1,308,672.48/939.84
  6. Step 6: Final answer
    x = 1,392.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.