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Finding the Fourth Proportional to 1,105.22, 1,522.70 and 855.68

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Solution

The fourth proportional to 1,105.22, 1,522.70 and 855.68 is: 1,178.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.22 : 1,522.70 = 855.68 : x
  2. Step 2: Convert to fraction form
    1,105.22/1,522.70 = 855.68/x
  3. Step 3: Cross multiply
    1,105.22x = 1,522.70 × 855.68
  4. Step 4: Simplify right side
    1,105.22x = 1,302,943.94
  5. Step 5: Solve for x
    x = 1,302,943.94/1,105.22
  6. Step 6: Final answer
    x = 1,178.90

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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.