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Finding the Fourth Proportional to 1,393.80, 1,923.62 and 834.58

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Solution

The fourth proportional to 1,393.80, 1,923.62 and 834.58 is: 1,151.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.80 : 1,923.62 = 834.58 : x
  2. Step 2: Convert to fraction form
    1,393.80/1,923.62 = 834.58/x
  3. Step 3: Cross multiply
    1,393.80x = 1,923.62 × 834.58
  4. Step 4: Simplify right side
    1,393.80x = 1,605,414.78
  5. Step 5: Solve for x
    x = 1,605,414.78/1,393.80
  6. Step 6: Final answer
    x = 1,151.83

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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.