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Finding the Fourth Proportional to 853.74, 1,280.61 and 268.75

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Solution

The fourth proportional to 853.74, 1,280.61 and 268.75 is: 403.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.74 : 1,280.61 = 268.75 : x
  2. Step 2: Convert to fraction form
    853.74/1,280.61 = 268.75/x
  3. Step 3: Cross multiply
    853.74x = 1,280.61 × 268.75
  4. Step 4: Simplify right side
    853.74x = 344,163.94
  5. Step 5: Solve for x
    x = 344,163.94/853.74
  6. Step 6: Final answer
    x = 403.13

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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.