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Finding the Fourth Proportional to 1,290.60, 1,936.17 and 401.22

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Solution

The fourth proportional to 1,290.60, 1,936.17 and 401.22 is: 601.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.60 : 1,936.17 = 401.22 : x
  2. Step 2: Convert to fraction form
    1,290.60/1,936.17 = 401.22/x
  3. Step 3: Cross multiply
    1,290.60x = 1,936.17 × 401.22
  4. Step 4: Simplify right side
    1,290.60x = 776,830.13
  5. Step 5: Solve for x
    x = 776,830.13/1,290.60
  6. Step 6: Final answer
    x = 601.91

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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.