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Finding the Fourth Proportional to 692.49, 1,038.90 and 367.80

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Solution

The fourth proportional to 692.49, 1,038.90 and 367.80 is: 551.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.49 : 1,038.90 = 367.80 : x
  2. Step 2: Convert to fraction form
    692.49/1,038.90 = 367.80/x
  3. Step 3: Cross multiply
    692.49x = 1,038.90 × 367.80
  4. Step 4: Simplify right side
    692.49x = 382,107.42
  5. Step 5: Solve for x
    x = 382,107.42/692.49
  6. Step 6: Final answer
    x = 551.79

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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.