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Finding the Fourth Proportional to 692.60, 955.76 and 397.89

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Solution

The fourth proportional to 692.60, 955.76 and 397.89 is: 549.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.60 : 955.76 = 397.89 : x
  2. Step 2: Convert to fraction form
    692.60/955.76 = 397.89/x
  3. Step 3: Cross multiply
    692.60x = 955.76 × 397.89
  4. Step 4: Simplify right side
    692.60x = 380,285.36
  5. Step 5: Solve for x
    x = 380,285.36/692.60
  6. Step 6: Final answer
    x = 549.07

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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.