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Finding the Fourth Proportional to 1,226.15, 1,692.09 and 666.62

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Solution

The fourth proportional to 1,226.15, 1,692.09 and 666.62 is: 919.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.15 : 1,692.09 = 666.62 : x
  2. Step 2: Convert to fraction form
    1,226.15/1,692.09 = 666.62/x
  3. Step 3: Cross multiply
    1,226.15x = 1,692.09 × 666.62
  4. Step 4: Simplify right side
    1,226.15x = 1,127,972.58
  5. Step 5: Solve for x
    x = 1,127,972.58/1,226.15
  6. Step 6: Final answer
    x = 919.93

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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.