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Finding the Fourth Proportional to 1,226.84, 1,693 and 667.28

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Solution

The fourth proportional to 1,226.84, 1,693 and 667.28 is: 920.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.84 : 1,693 = 667.28 : x
  2. Step 2: Convert to fraction form
    1,226.84/1,693 = 667.28/x
  3. Step 3: Cross multiply
    1,226.84x = 1,693 × 667.28
  4. Step 4: Simplify right side
    1,226.84x = 1,129,705.04
  5. Step 5: Solve for x
    x = 1,129,705.04/1,226.84
  6. Step 6: Final answer
    x = 920.83

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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.