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Finding the Fourth Proportional to 8,619.63, 11,879.78 and 7,421.54

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Solution

The fourth proportional to 8,619.63, 11,879.78 and 7,421.54 is: 10,228.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.63 : 11,879.78 = 7,421.54 : x
  2. Step 2: Convert to fraction form
    8,619.63/11,879.78 = 7,421.54/x
  3. Step 3: Cross multiply
    8,619.63x = 11,879.78 × 7,421.54
  4. Step 4: Simplify right side
    8,619.63x = 88,166,165.95
  5. Step 5: Solve for x
    x = 88,166,165.95/8,619.63
  6. Step 6: Final answer
    x = 10,228.53

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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.