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Finding the Fourth Proportional to 2,279.78, 3,420.10 and 818.86

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Solution

The fourth proportional to 2,279.78, 3,420.10 and 818.86 is: 1,228.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.78 : 3,420.10 = 818.86 : x
  2. Step 2: Convert to fraction form
    2,279.78/3,420.10 = 818.86/x
  3. Step 3: Cross multiply
    2,279.78x = 3,420.10 × 818.86
  4. Step 4: Simplify right side
    2,279.78x = 2,800,583.09
  5. Step 5: Solve for x
    x = 2,800,583.09/2,279.78
  6. Step 6: Final answer
    x = 1,228.44

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1.5x scale

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.