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Finding the Fourth Proportional to 939.78, 1,288.46 and 925.44

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Solution

The fourth proportional to 939.78, 1,288.46 and 925.44 is: 1,268.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.78 : 1,288.46 = 925.44 : x
  2. Step 2: Convert to fraction form
    939.78/1,288.46 = 925.44/x
  3. Step 3: Cross multiply
    939.78x = 1,288.46 × 925.44
  4. Step 4: Simplify right side
    939.78x = 1,192,387.80
  5. Step 5: Solve for x
    x = 1,192,387.80/939.78
  6. Step 6: Final answer
    x = 1,268.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.