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Finding the Fourth Proportional to 1,905.26, 2,857.93 and 865.31

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Solution

The fourth proportional to 1,905.26, 2,857.93 and 865.31 is: 1,297.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.26 : 2,857.93 = 865.31 : x
  2. Step 2: Convert to fraction form
    1,905.26/2,857.93 = 865.31/x
  3. Step 3: Cross multiply
    1,905.26x = 2,857.93 × 865.31
  4. Step 4: Simplify right side
    1,905.26x = 2,472,978.96
  5. Step 5: Solve for x
    x = 2,472,978.96/1,905.26
  6. Step 6: Final answer
    x = 1,297.98

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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.