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Finding the Fourth Proportional to 692.87, 956.05 and 398.09

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Solution

The fourth proportional to 692.87, 956.05 and 398.09 is: 549.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.87 : 956.05 = 398.09 : x
  2. Step 2: Convert to fraction form
    692.87/956.05 = 398.09/x
  3. Step 3: Cross multiply
    692.87x = 956.05 × 398.09
  4. Step 4: Simplify right side
    692.87x = 380,588.17
  5. Step 5: Solve for x
    x = 380,588.17/692.87
  6. Step 6: Final answer
    x = 549.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.