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Finding the Fourth Proportional to 8,121.90, 11,195.10 and 8,121.90

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Solution

The fourth proportional to 8,121.90, 11,195.10 and 8,121.90 is: 11,195.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.90 : 11,195.10 = 8,121.90 : x
  2. Step 2: Convert to fraction form
    8,121.90/11,195.10 = 8,121.90/x
  3. Step 3: Cross multiply
    8,121.90x = 11,195.10 × 8,121.90
  4. Step 4: Simplify right side
    8,121.90x = 90,925,482.69
  5. Step 5: Solve for x
    x = 90,925,482.69/8,121.90
  6. Step 6: Final answer
    x = 11,195.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.