Home / 8,112.24-12,172.20-7,981.20

Finding the Fourth Proportional to 8,112.24, 12,172.20 and 7,981.20

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Solution

The fourth proportional to 8,112.24, 12,172.20 and 7,981.20 is: 11,975.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,112.24 : 12,172.20 = 7,981.20 : x
  2. Step 2: Convert to fraction form
    8,112.24/12,172.20 = 7,981.20/x
  3. Step 3: Cross multiply
    8,112.24x = 12,172.20 × 7,981.20
  4. Step 4: Simplify right side
    8,112.24x = 97,148,762.64
  5. Step 5: Solve for x
    x = 97,148,762.64/8,112.24
  6. Step 6: Final answer
    x = 11,975.58

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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.