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Finding the Fourth Proportional to 1,290.74, 1,936.09 and 316.83

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Solution

The fourth proportional to 1,290.74, 1,936.09 and 316.83 is: 475.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.74 : 1,936.09 = 316.83 : x
  2. Step 2: Convert to fraction form
    1,290.74/1,936.09 = 316.83/x
  3. Step 3: Cross multiply
    1,290.74x = 1,936.09 × 316.83
  4. Step 4: Simplify right side
    1,290.74x = 613,406.38
  5. Step 5: Solve for x
    x = 613,406.38/1,290.74
  6. Step 6: Final answer
    x = 475.24

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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.