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Finding the Fourth Proportional to 853.41, 1,279.95 and 391.08

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Solution

The fourth proportional to 853.41, 1,279.95 and 391.08 is: 586.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.41 : 1,279.95 = 391.08 : x
  2. Step 2: Convert to fraction form
    853.41/1,279.95 = 391.08/x
  3. Step 3: Cross multiply
    853.41x = 1,279.95 × 391.08
  4. Step 4: Simplify right side
    853.41x = 500,562.85
  5. Step 5: Solve for x
    x = 500,562.85/853.41
  6. Step 6: Final answer
    x = 586.54

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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.