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Finding the Fourth Proportional to 1,294.23, 1,939.31 and 806.55

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Solution

The fourth proportional to 1,294.23, 1,939.31 and 806.55 is: 1,208.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.23 : 1,939.31 = 806.55 : x
  2. Step 2: Convert to fraction form
    1,294.23/1,939.31 = 806.55/x
  3. Step 3: Cross multiply
    1,294.23x = 1,939.31 × 806.55
  4. Step 4: Simplify right side
    1,294.23x = 1,564,146.45
  5. Step 5: Solve for x
    x = 1,564,146.45/1,294.23
  6. Step 6: Final answer
    x = 1,208.55

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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.