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Finding the Fourth Proportional to 3,105, 4,285.53 and 1,910.39

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Solution

The fourth proportional to 3,105, 4,285.53 and 1,910.39 is: 2,636.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,105 : 4,285.53 = 1,910.39 : x
  2. Step 2: Convert to fraction form
    3,105/4,285.53 = 1,910.39/x
  3. Step 3: Cross multiply
    3,105x = 4,285.53 × 1,910.39
  4. Step 4: Simplify right side
    3,105x = 8,187,012.23
  5. Step 5: Solve for x
    x = 8,187,012.23/3,105
  6. Step 6: Final answer
    x = 2,636.72

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Half scale
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Double scale
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Similar ratio
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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.