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Finding the Fourth Proportional to 1,391.83, 2,087.74 and 559.26

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Solution

The fourth proportional to 1,391.83, 2,087.74 and 559.26 is: 838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.83 : 2,087.74 = 559.26 : x
  2. Step 2: Convert to fraction form
    1,391.83/2,087.74 = 559.26/x
  3. Step 3: Cross multiply
    1,391.83x = 2,087.74 × 559.26
  4. Step 4: Simplify right side
    1,391.83x = 1,167,589.47
  5. Step 5: Solve for x
    x = 1,167,589.47/1,391.83
  6. Step 6: Final answer
    x = 838.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.