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Finding the Fourth Proportional to 2,805.79, 4,208.53 and 857.99

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Solution

The fourth proportional to 2,805.79, 4,208.53 and 857.99 is: 1,286.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.79 : 4,208.53 = 857.99 : x
  2. Step 2: Convert to fraction form
    2,805.79/4,208.53 = 857.99/x
  3. Step 3: Cross multiply
    2,805.79x = 4,208.53 × 857.99
  4. Step 4: Simplify right side
    2,805.79x = 3,610,889.05
  5. Step 5: Solve for x
    x = 3,610,889.05/2,805.79
  6. Step 6: Final answer
    x = 1,286.94

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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.