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Finding the Fourth Proportional to 838.39, 1,157.38 and 559.09

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Solution

The fourth proportional to 838.39, 1,157.38 and 559.09 is: 771.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.39 : 1,157.38 = 559.09 : x
  2. Step 2: Convert to fraction form
    838.39/1,157.38 = 559.09/x
  3. Step 3: Cross multiply
    838.39x = 1,157.38 × 559.09
  4. Step 4: Simplify right side
    838.39x = 647,076.79
  5. Step 5: Solve for x
    x = 647,076.79/838.39
  6. Step 6: Final answer
    x = 771.81

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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.