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Finding the Fourth Proportional to 853.36, 1,279.88 and 305.54

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Solution

The fourth proportional to 853.36, 1,279.88 and 305.54 is: 458.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.36 : 1,279.88 = 305.54 : x
  2. Step 2: Convert to fraction form
    853.36/1,279.88 = 305.54/x
  3. Step 3: Cross multiply
    853.36x = 1,279.88 × 305.54
  4. Step 4: Simplify right side
    853.36x = 391,054.54
  5. Step 5: Solve for x
    x = 391,054.54/853.36
  6. Step 6: Final answer
    x = 458.25

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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.