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Finding the Fourth Proportional to 1,226.50, 1,692.21 and 728.89

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Solution

The fourth proportional to 1,226.50, 1,692.21 and 728.89 is: 1,005.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.50 : 1,692.21 = 728.89 : x
  2. Step 2: Convert to fraction form
    1,226.50/1,692.21 = 728.89/x
  3. Step 3: Cross multiply
    1,226.50x = 1,692.21 × 728.89
  4. Step 4: Simplify right side
    1,226.50x = 1,233,434.95
  5. Step 5: Solve for x
    x = 1,233,434.95/1,226.50
  6. Step 6: Final answer
    x = 1,005.65

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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.