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Finding the Fourth Proportional to 1,280.88, 1,919.97 and 663.99

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Solution

The fourth proportional to 1,280.88, 1,919.97 and 663.99 is: 995.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.88 : 1,919.97 = 663.99 : x
  2. Step 2: Convert to fraction form
    1,280.88/1,919.97 = 663.99/x
  3. Step 3: Cross multiply
    1,280.88x = 1,919.97 × 663.99
  4. Step 4: Simplify right side
    1,280.88x = 1,274,840.88
  5. Step 5: Solve for x
    x = 1,274,840.88/1,280.88
  6. Step 6: Final answer
    x = 995.29

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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.