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Finding the Fourth Proportional to 1,398.03, 1,942.65 and 1,382.84

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Solution

The fourth proportional to 1,398.03, 1,942.65 and 1,382.84 is: 1,921.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.03 : 1,942.65 = 1,382.84 : x
  2. Step 2: Convert to fraction form
    1,398.03/1,942.65 = 1,382.84/x
  3. Step 3: Cross multiply
    1,398.03x = 1,942.65 × 1,382.84
  4. Step 4: Simplify right side
    1,398.03x = 2,686,364.41
  5. Step 5: Solve for x
    x = 2,686,364.41/1,398.03
  6. Step 6: Final answer
    x = 1,921.54

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.