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Finding the Fourth Proportional to 8,427.78, 11,629.98 and 4,890.78

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Solution

The fourth proportional to 8,427.78, 11,629.98 and 4,890.78 is: 6,749.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,427.78 : 11,629.98 = 4,890.78 : x
  2. Step 2: Convert to fraction form
    8,427.78/11,629.98 = 4,890.78/x
  3. Step 3: Cross multiply
    8,427.78x = 11,629.98 × 4,890.78
  4. Step 4: Simplify right side
    8,427.78x = 56,879,673.58
  5. Step 5: Solve for x
    x = 56,879,673.58/8,427.78
  6. Step 6: Final answer
    x = 6,749.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.