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Finding the Fourth Proportional to 1,278.11, 1,917.50 and 692.84

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Solution

The fourth proportional to 1,278.11, 1,917.50 and 692.84 is: 1,039.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.11 : 1,917.50 = 692.84 : x
  2. Step 2: Convert to fraction form
    1,278.11/1,917.50 = 692.84/x
  3. Step 3: Cross multiply
    1,278.11x = 1,917.50 × 692.84
  4. Step 4: Simplify right side
    1,278.11x = 1,328,522.03
  5. Step 5: Solve for x
    x = 1,328,522.03/1,278.11
  6. Step 6: Final answer
    x = 1,039.44

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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.