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Finding the Fourth Proportional to 853.94, 1,280.51 and 305.97

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Solution

The fourth proportional to 853.94, 1,280.51 and 305.97 is: 458.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.94 : 1,280.51 = 305.97 : x
  2. Step 2: Convert to fraction form
    853.94/1,280.51 = 305.97/x
  3. Step 3: Cross multiply
    853.94x = 1,280.51 × 305.97
  4. Step 4: Simplify right side
    853.94x = 391,796.11
  5. Step 5: Solve for x
    x = 391,796.11/853.94
  6. Step 6: Final answer
    x = 458.81

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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.