Home / 2,815.60-3,885.78-1,620.76

Finding the Fourth Proportional to 2,815.60, 3,885.78 and 1,620.76

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Solution

The fourth proportional to 2,815.60, 3,885.78 and 1,620.76 is: 2,236.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.60 : 3,885.78 = 1,620.76 : x
  2. Step 2: Convert to fraction form
    2,815.60/3,885.78 = 1,620.76/x
  3. Step 3: Cross multiply
    2,815.60x = 3,885.78 × 1,620.76
  4. Step 4: Simplify right side
    2,815.60x = 6,297,916.79
  5. Step 5: Solve for x
    x = 6,297,916.79/2,815.60
  6. Step 6: Final answer
    x = 2,236.79

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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.