Home / 8,112.40-12,154.20-6,643.60

Finding the Fourth Proportional to 8,112.40, 12,154.20 and 6,643.60

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Solution

The fourth proportional to 8,112.40, 12,154.20 and 6,643.60 is: 9,953.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,112.40 : 12,154.20 = 6,643.60 : x
  2. Step 2: Convert to fraction form
    8,112.40/12,154.20 = 6,643.60/x
  3. Step 3: Cross multiply
    8,112.40x = 12,154.20 × 6,643.60
  4. Step 4: Simplify right side
    8,112.40x = 80,747,643.12
  5. Step 5: Solve for x
    x = 80,747,643.12/8,112.40
  6. Step 6: Final answer
    x = 9,953.61

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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.