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Finding the Fourth Proportional to 1,830.47, 2,745.70 and 857.25

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Solution

The fourth proportional to 1,830.47, 2,745.70 and 857.25 is: 1,285.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,830.47 : 2,745.70 = 857.25 : x
  2. Step 2: Convert to fraction form
    1,830.47/2,745.70 = 857.25/x
  3. Step 3: Cross multiply
    1,830.47x = 2,745.70 × 857.25
  4. Step 4: Simplify right side
    1,830.47x = 2,353,751.33
  5. Step 5: Solve for x
    x = 2,353,751.33/1,830.47
  6. Step 6: Final answer
    x = 1,285.87

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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.