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Finding the Fourth Proportional to 2,153.64, 3,229.77 and 692.43

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Solution

The fourth proportional to 2,153.64, 3,229.77 and 692.43 is: 1,038.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.64 : 3,229.77 = 692.43 : x
  2. Step 2: Convert to fraction form
    2,153.64/3,229.77 = 692.43/x
  3. Step 3: Cross multiply
    2,153.64x = 3,229.77 × 692.43
  4. Step 4: Simplify right side
    2,153.64x = 2,236,389.64
  5. Step 5: Solve for x
    x = 2,236,389.64/2,153.64
  6. Step 6: Final answer
    x = 1,038.42

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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.