Home / 3,105.40-4,285.47-1,689.11

Finding the Fourth Proportional to 3,105.40, 4,285.47 and 1,689.11

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Solution

The fourth proportional to 3,105.40, 4,285.47 and 1,689.11 is: 2,330.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,105.40 : 4,285.47 = 1,689.11 : x
  2. Step 2: Convert to fraction form
    3,105.40/4,285.47 = 1,689.11/x
  3. Step 3: Cross multiply
    3,105.40x = 4,285.47 × 1,689.11
  4. Step 4: Simplify right side
    3,105.40x = 7,238,608.80
  5. Step 5: Solve for x
    x = 7,238,608.80/3,105.40
  6. Step 6: Final answer
    x = 2,330.97

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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.