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Finding the Fourth Proportional to 2,856.70, 4,281.19 and 1,211.19

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Solution

The fourth proportional to 2,856.70, 4,281.19 and 1,211.19 is: 1,815.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.70 : 4,281.19 = 1,211.19 : x
  2. Step 2: Convert to fraction form
    2,856.70/4,281.19 = 1,211.19/x
  3. Step 3: Cross multiply
    2,856.70x = 4,281.19 × 1,211.19
  4. Step 4: Simplify right side
    2,856.70x = 5,185,315.43
  5. Step 5: Solve for x
    x = 5,185,315.43/2,856.70
  6. Step 6: Final answer
    x = 1,815.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.