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Finding the Fourth Proportional to 692.55, 955.70 and 397.81

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Solution

The fourth proportional to 692.55, 955.70 and 397.81 is: 548.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.55 : 955.70 = 397.81 : x
  2. Step 2: Convert to fraction form
    692.55/955.70 = 397.81/x
  3. Step 3: Cross multiply
    692.55x = 955.70 × 397.81
  4. Step 4: Simplify right side
    692.55x = 380,187.71
  5. Step 5: Solve for x
    x = 380,187.71/692.55
  6. Step 6: Final answer
    x = 548.97

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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.