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Finding the Fourth Proportional to 1,226.44, 1,692.47 and 666.88

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Solution

The fourth proportional to 1,226.44, 1,692.47 and 666.88 is: 920.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.44 : 1,692.47 = 666.88 : x
  2. Step 2: Convert to fraction form
    1,226.44/1,692.47 = 666.88/x
  3. Step 3: Cross multiply
    1,226.44x = 1,692.47 × 666.88
  4. Step 4: Simplify right side
    1,226.44x = 1,128,674.39
  5. Step 5: Solve for x
    x = 1,128,674.39/1,226.44
  6. Step 6: Final answer
    x = 920.29

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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.