Home / 3,105.45-4,285.61-1,689.23

Finding the Fourth Proportional to 3,105.45, 4,285.61 and 1,689.23

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Solution

The fourth proportional to 3,105.45, 4,285.61 and 1,689.23 is: 2,331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,105.45 : 4,285.61 = 1,689.23 : x
  2. Step 2: Convert to fraction form
    3,105.45/4,285.61 = 1,689.23/x
  3. Step 3: Cross multiply
    3,105.45x = 4,285.61 × 1,689.23
  4. Step 4: Simplify right side
    3,105.45x = 7,239,351.11
  5. Step 5: Solve for x
    x = 7,239,351.11/3,105.45
  6. Step 6: Final answer
    x = 2,331.18

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Half scale
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Double scale
Find fourth proportional to 3,106.45, 4,286.99 and 1,690.23
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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.