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Finding the Fourth Proportional to 1,946.34, 2,919.78 and 905.82

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Solution

The fourth proportional to 1,946.34, 2,919.78 and 905.82 is: 1,358.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.34 : 2,919.78 = 905.82 : x
  2. Step 2: Convert to fraction form
    1,946.34/2,919.78 = 905.82/x
  3. Step 3: Cross multiply
    1,946.34x = 2,919.78 × 905.82
  4. Step 4: Simplify right side
    1,946.34x = 2,644,795.12
  5. Step 5: Solve for x
    x = 2,644,795.12/1,946.34
  6. Step 6: Final answer
    x = 1,358.86

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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.