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Finding the Fourth Proportional to 692.30, 955.36 and 397.56

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Solution

The fourth proportional to 692.30, 955.36 and 397.56 is: 548.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.30 : 955.36 = 397.56 : x
  2. Step 2: Convert to fraction form
    692.30/955.36 = 397.56/x
  3. Step 3: Cross multiply
    692.30x = 955.36 × 397.56
  4. Step 4: Simplify right side
    692.30x = 379,812.92
  5. Step 5: Solve for x
    x = 379,812.92/692.30
  6. Step 6: Final answer
    x = 548.62

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1.5x scale

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.