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Finding the Fourth Proportional to 1,290.82, 1,936.04 and 425.14

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Solution

The fourth proportional to 1,290.82, 1,936.04 and 425.14 is: 637.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.82 : 1,936.04 = 425.14 : x
  2. Step 2: Convert to fraction form
    1,290.82/1,936.04 = 425.14/x
  3. Step 3: Cross multiply
    1,290.82x = 1,936.04 × 425.14
  4. Step 4: Simplify right side
    1,290.82x = 823,088.05
  5. Step 5: Solve for x
    x = 823,088.05/1,290.82
  6. Step 6: Final answer
    x = 637.65

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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.