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Finding the Fourth Proportional to 1,858.40, 2,563.20 and 1,268

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Solution

The fourth proportional to 1,858.40, 2,563.20 and 1,268 is: 1,748.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.40 : 2,563.20 = 1,268 : x
  2. Step 2: Convert to fraction form
    1,858.40/2,563.20 = 1,268/x
  3. Step 3: Cross multiply
    1,858.40x = 2,563.20 × 1,268
  4. Step 4: Simplify right side
    1,858.40x = 3,250,137.60
  5. Step 5: Solve for x
    x = 3,250,137.60/1,858.40
  6. Step 6: Final answer
    x = 1,748.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.