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Finding the Fourth Proportional to 1,226.70, 1,692.80 and 667.15

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Solution

The fourth proportional to 1,226.70, 1,692.80 and 667.15 is: 920.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.70 : 1,692.80 = 667.15 : x
  2. Step 2: Convert to fraction form
    1,226.70/1,692.80 = 667.15/x
  3. Step 3: Cross multiply
    1,226.70x = 1,692.80 × 667.15
  4. Step 4: Simplify right side
    1,226.70x = 1,129,351.52
  5. Step 5: Solve for x
    x = 1,129,351.52/1,226.70
  6. Step 6: Final answer
    x = 920.64

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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.