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Finding the Fourth Proportional to 386.70, 580.05 and 194.28

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Solution

The fourth proportional to 386.70, 580.05 and 194.28 is: 291.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.70 : 580.05 = 194.28 : x
  2. Step 2: Convert to fraction form
    386.70/580.05 = 194.28/x
  3. Step 3: Cross multiply
    386.70x = 580.05 × 194.28
  4. Step 4: Simplify right side
    386.70x = 112,692.11
  5. Step 5: Solve for x
    x = 112,692.11/386.70
  6. Step 6: Final answer
    x = 291.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.