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Finding the Fourth Proportional to 2,805, 4,207.48 and 857.18

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Solution

The fourth proportional to 2,805, 4,207.48 and 857.18 is: 1,285.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805 : 4,207.48 = 857.18 : x
  2. Step 2: Convert to fraction form
    2,805/4,207.48 = 857.18/x
  3. Step 3: Cross multiply
    2,805x = 4,207.48 × 857.18
  4. Step 4: Simplify right side
    2,805x = 3,606,567.71
  5. Step 5: Solve for x
    x = 3,606,567.71/2,805
  6. Step 6: Final answer
    x = 1,285.76

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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.