Home / 3,105.42-4,285.56-1,689.20

Finding the Fourth Proportional to 3,105.42, 4,285.56 and 1,689.20

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Solution

The fourth proportional to 3,105.42, 4,285.56 and 1,689.20 is: 2,331.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,105.42 : 4,285.56 = 1,689.20 : x
  2. Step 2: Convert to fraction form
    3,105.42/4,285.56 = 1,689.20/x
  3. Step 3: Cross multiply
    3,105.42x = 4,285.56 × 1,689.20
  4. Step 4: Simplify right side
    3,105.42x = 7,239,146.52
  5. Step 5: Solve for x
    x = 7,239,146.52/3,105.42
  6. Step 6: Final answer
    x = 2,331.13

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Half scale
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Double scale
Find fourth proportional to 3,106.42, 4,286.94 and 1,690.20
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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.