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Finding the Fourth Proportional to 1,103.08, 1,522.26 and 689

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Solution

The fourth proportional to 1,103.08, 1,522.26 and 689 is: 950.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.08 : 1,522.26 = 689 : x
  2. Step 2: Convert to fraction form
    1,103.08/1,522.26 = 689/x
  3. Step 3: Cross multiply
    1,103.08x = 1,522.26 × 689
  4. Step 4: Simplify right side
    1,103.08x = 1,048,837.14
  5. Step 5: Solve for x
    x = 1,048,837.14/1,103.08
  6. Step 6: Final answer
    x = 950.83

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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.