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Finding the Fourth Proportional to 1,294.61, 1,940.90 and 677.88

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Solution

The fourth proportional to 1,294.61, 1,940.90 and 677.88 is: 1,016.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.61 : 1,940.90 = 677.88 : x
  2. Step 2: Convert to fraction form
    1,294.61/1,940.90 = 677.88/x
  3. Step 3: Cross multiply
    1,294.61x = 1,940.90 × 677.88
  4. Step 4: Simplify right side
    1,294.61x = 1,315,693.90
  5. Step 5: Solve for x
    x = 1,315,693.90/1,294.61
  6. Step 6: Final answer
    x = 1,016.29

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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.