Home / 2,856.90-3,942.84-1,678.38

Finding the Fourth Proportional to 2,856.90, 3,942.84 and 1,678.38

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Solution

The fourth proportional to 2,856.90, 3,942.84 and 1,678.38 is: 2,316.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.90 : 3,942.84 = 1,678.38 : x
  2. Step 2: Convert to fraction form
    2,856.90/3,942.84 = 1,678.38/x
  3. Step 3: Cross multiply
    2,856.90x = 3,942.84 × 1,678.38
  4. Step 4: Simplify right side
    2,856.90x = 6,617,583.80
  5. Step 5: Solve for x
    x = 6,617,583.80/2,856.90
  6. Step 6: Final answer
    x = 2,316.35

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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.