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Finding the Fourth Proportional to 8,108.40, 10,980.90 and 8,108.40

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Solution

The fourth proportional to 8,108.40, 10,980.90 and 8,108.40 is: 10,980.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,108.40 : 10,980.90 = 8,108.40 : x
  2. Step 2: Convert to fraction form
    8,108.40/10,980.90 = 8,108.40/x
  3. Step 3: Cross multiply
    8,108.40x = 10,980.90 × 8,108.40
  4. Step 4: Simplify right side
    8,108.40x = 89,037,529.56
  5. Step 5: Solve for x
    x = 89,037,529.56/8,108.40
  6. Step 6: Final answer
    x = 10,980.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.