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Finding the Fourth Proportional to 1,293.61, 1,940.39 and 319.71

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Solution

The fourth proportional to 1,293.61, 1,940.39 and 319.71 is: 479.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.61 : 1,940.39 = 319.71 : x
  2. Step 2: Convert to fraction form
    1,293.61/1,940.39 = 319.71/x
  3. Step 3: Cross multiply
    1,293.61x = 1,940.39 × 319.71
  4. Step 4: Simplify right side
    1,293.61x = 620,362.09
  5. Step 5: Solve for x
    x = 620,362.09/1,293.61
  6. Step 6: Final answer
    x = 479.56

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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.