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Finding the Fourth Proportional to 692.39, 955.45 and 397.60

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Solution

The fourth proportional to 692.39, 955.45 and 397.60 is: 548.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.39 : 955.45 = 397.60 : x
  2. Step 2: Convert to fraction form
    692.39/955.45 = 397.60/x
  3. Step 3: Cross multiply
    692.39x = 955.45 × 397.60
  4. Step 4: Simplify right side
    692.39x = 379,886.92
  5. Step 5: Solve for x
    x = 379,886.92/692.39
  6. Step 6: Final answer
    x = 548.66

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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.