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Finding the Fourth Proportional to 1,294.52, 1,939.98 and 678.20

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Solution

The fourth proportional to 1,294.52, 1,939.98 and 678.20 is: 1,016.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.52 : 1,939.98 = 678.20 : x
  2. Step 2: Convert to fraction form
    1,294.52/1,939.98 = 678.20/x
  3. Step 3: Cross multiply
    1,294.52x = 1,939.98 × 678.20
  4. Step 4: Simplify right side
    1,294.52x = 1,315,694.44
  5. Step 5: Solve for x
    x = 1,315,694.44/1,294.52
  6. Step 6: Final answer
    x = 1,016.36

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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.