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Finding the Fourth Proportional to 8,460.40, 12,676.20 and 6,991.60

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Solution

The fourth proportional to 8,460.40, 12,676.20 and 6,991.60 is: 10,475.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,460.40 : 12,676.20 = 6,991.60 : x
  2. Step 2: Convert to fraction form
    8,460.40/12,676.20 = 6,991.60/x
  3. Step 3: Cross multiply
    8,460.40x = 12,676.20 × 6,991.60
  4. Step 4: Simplify right side
    8,460.40x = 88,626,919.92
  5. Step 5: Solve for x
    x = 88,626,919.92/8,460.40
  6. Step 6: Final answer
    x = 10,475.50

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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.