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Finding the Fourth Proportional to 1,129.25, 1,692.68 and 667.25

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Solution

The fourth proportional to 1,129.25, 1,692.68 and 667.25 is: 1,000.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.25 : 1,692.68 = 667.25 : x
  2. Step 2: Convert to fraction form
    1,129.25/1,692.68 = 667.25/x
  3. Step 3: Cross multiply
    1,129.25x = 1,692.68 × 667.25
  4. Step 4: Simplify right side
    1,129.25x = 1,129,440.73
  5. Step 5: Solve for x
    x = 1,129,440.73/1,129.25
  6. Step 6: Final answer
    x = 1,000.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.