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Finding the Fourth Proportional to 1,309.09, 1,963.74 and 692.78

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Solution

The fourth proportional to 1,309.09, 1,963.74 and 692.78 is: 1,039.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.09 : 1,963.74 = 692.78 : x
  2. Step 2: Convert to fraction form
    1,309.09/1,963.74 = 692.78/x
  3. Step 3: Cross multiply
    1,309.09x = 1,963.74 × 692.78
  4. Step 4: Simplify right side
    1,309.09x = 1,360,438.10
  5. Step 5: Solve for x
    x = 1,360,438.10/1,309.09
  6. Step 6: Final answer
    x = 1,039.23

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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.