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Finding the Fourth Proportional to 2,579.81, 3,869.99 and 824.20

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Solution

The fourth proportional to 2,579.81, 3,869.99 and 824.20 is: 1,236.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,579.81 : 3,869.99 = 824.20 : x
  2. Step 2: Convert to fraction form
    2,579.81/3,869.99 = 824.20/x
  3. Step 3: Cross multiply
    2,579.81x = 3,869.99 × 824.20
  4. Step 4: Simplify right side
    2,579.81x = 3,189,631.96
  5. Step 5: Solve for x
    x = 3,189,631.96/2,579.81
  6. Step 6: Final answer
    x = 1,236.38

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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.