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Finding the Fourth Proportional to 853.99, 1,280.26 and 268.63

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Solution

The fourth proportional to 853.99, 1,280.26 and 268.63 is: 402.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.99 : 1,280.26 = 268.63 : x
  2. Step 2: Convert to fraction form
    853.99/1,280.26 = 268.63/x
  3. Step 3: Cross multiply
    853.99x = 1,280.26 × 268.63
  4. Step 4: Simplify right side
    853.99x = 343,912.37
  5. Step 5: Solve for x
    x = 343,912.37/853.99
  6. Step 6: Final answer
    x = 402.71

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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.