Home / 2,856.90-3,942.11-1,678.35

Finding the Fourth Proportional to 2,856.90, 3,942.11 and 1,678.35

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Solution

The fourth proportional to 2,856.90, 3,942.11 and 1,678.35 is: 2,315.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.90 : 3,942.11 = 1,678.35 : x
  2. Step 2: Convert to fraction form
    2,856.90/3,942.11 = 1,678.35/x
  3. Step 3: Cross multiply
    2,856.90x = 3,942.11 × 1,678.35
  4. Step 4: Simplify right side
    2,856.90x = 6,616,231.93
  5. Step 5: Solve for x
    x = 6,616,231.93/2,856.90
  6. Step 6: Final answer
    x = 2,315.88

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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.