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Finding the Fourth Proportional to 8,486.10, 12,741.30 and 6,420.60

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Solution

The fourth proportional to 8,486.10, 12,741.30 and 6,420.60 is: 9,640.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,486.10 : 12,741.30 = 6,420.60 : x
  2. Step 2: Convert to fraction form
    8,486.10/12,741.30 = 6,420.60/x
  3. Step 3: Cross multiply
    8,486.10x = 12,741.30 × 6,420.60
  4. Step 4: Simplify right side
    8,486.10x = 81,806,790.78
  5. Step 5: Solve for x
    x = 81,806,790.78/8,486.10
  6. Step 6: Final answer
    x = 9,640.09

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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.