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Finding the Fourth Proportional to 1,338.68, 1,846.34 and 939.64

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Solution

The fourth proportional to 1,338.68, 1,846.34 and 939.64 is: 1,295.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.68 : 1,846.34 = 939.64 : x
  2. Step 2: Convert to fraction form
    1,338.68/1,846.34 = 939.64/x
  3. Step 3: Cross multiply
    1,338.68x = 1,846.34 × 939.64
  4. Step 4: Simplify right side
    1,338.68x = 1,734,894.92
  5. Step 5: Solve for x
    x = 1,734,894.92/1,338.68
  6. Step 6: Final answer
    x = 1,295.97

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1.5x scale

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.