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Finding the Fourth Proportional to 1,293.78, 1,940.66 and 319.89

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Solution

The fourth proportional to 1,293.78, 1,940.66 and 319.89 is: 479.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.78 : 1,940.66 = 319.89 : x
  2. Step 2: Convert to fraction form
    1,293.78/1,940.66 = 319.89/x
  3. Step 3: Cross multiply
    1,293.78x = 1,940.66 × 319.89
  4. Step 4: Simplify right side
    1,293.78x = 620,788.02
  5. Step 5: Solve for x
    x = 620,788.02/1,293.78
  6. Step 6: Final answer
    x = 479.83

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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.