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Finding the Fourth Proportional to 11,128.70, 16,690.86 and 4,108.70

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Solution

The fourth proportional to 11,128.70, 16,690.86 and 4,108.70 is: 6,162.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,128.70 : 16,690.86 = 4,108.70 : x
  2. Step 2: Convert to fraction form
    11,128.70/16,690.86 = 4,108.70/x
  3. Step 3: Cross multiply
    11,128.70x = 16,690.86 × 4,108.70
  4. Step 4: Simplify right side
    11,128.70x = 68,577,736.48
  5. Step 5: Solve for x
    x = 68,577,736.48/11,128.70
  6. Step 6: Final answer
    x = 6,162.24

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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.