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Finding the Fourth Proportional to 692.61, 955.74 and 397.89

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Solution

The fourth proportional to 692.61, 955.74 and 397.89 is: 549.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.61 : 955.74 = 397.89 : x
  2. Step 2: Convert to fraction form
    692.61/955.74 = 397.89/x
  3. Step 3: Cross multiply
    692.61x = 955.74 × 397.89
  4. Step 4: Simplify right side
    692.61x = 380,279.39
  5. Step 5: Solve for x
    x = 380,279.39/692.61
  6. Step 6: Final answer
    x = 549.05

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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.