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Finding the Fourth Proportional to 8,321.90, 12,486.48 and 4,421.74

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Solution

The fourth proportional to 8,321.90, 12,486.48 and 4,421.74 is: 6,634.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,321.90 : 12,486.48 = 4,421.74 : x
  2. Step 2: Convert to fraction form
    8,321.90/12,486.48 = 4,421.74/x
  3. Step 3: Cross multiply
    8,321.90x = 12,486.48 × 4,421.74
  4. Step 4: Simplify right side
    8,321.90x = 55,211,968.08
  5. Step 5: Solve for x
    x = 55,211,968.08/8,321.90
  6. Step 6: Final answer
    x = 6,634.54

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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.