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Finding the Fourth Proportional to 1,290.85, 1,936.28 and 316.95

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Solution

The fourth proportional to 1,290.85, 1,936.28 and 316.95 is: 475.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.85 : 1,936.28 = 316.95 : x
  2. Step 2: Convert to fraction form
    1,290.85/1,936.28 = 316.95/x
  3. Step 3: Cross multiply
    1,290.85x = 1,936.28 × 316.95
  4. Step 4: Simplify right side
    1,290.85x = 613,692.68
  5. Step 5: Solve for x
    x = 613,692.68/1,290.85
  6. Step 6: Final answer
    x = 475.42

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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.