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Finding the Fourth Proportional to 1,393.20, 1,922.98 and 896

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Solution

The fourth proportional to 1,393.20, 1,922.98 and 896 is: 1,236.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.20 : 1,922.98 = 896 : x
  2. Step 2: Convert to fraction form
    1,393.20/1,922.98 = 896/x
  3. Step 3: Cross multiply
    1,393.20x = 1,922.98 × 896
  4. Step 4: Simplify right side
    1,393.20x = 1,722,990.08
  5. Step 5: Solve for x
    x = 1,722,990.08/1,393.20
  6. Step 6: Final answer
    x = 1,236.71

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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.