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Finding the Fourth Proportional to 1,857.03, 2,783.87 and 686.25

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Solution

The fourth proportional to 1,857.03, 2,783.87 and 686.25 is: 1,028.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.03 : 2,783.87 = 686.25 : x
  2. Step 2: Convert to fraction form
    1,857.03/2,783.87 = 686.25/x
  3. Step 3: Cross multiply
    1,857.03x = 2,783.87 × 686.25
  4. Step 4: Simplify right side
    1,857.03x = 1,910,427.36
  5. Step 5: Solve for x
    x = 1,910,427.36/1,857.03
  6. Step 6: Final answer
    x = 1,028.75

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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.