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Finding the Fourth Proportional to 1,268.46, 1,900.50 and 780.48

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Solution

The fourth proportional to 1,268.46, 1,900.50 and 780.48 is: 1,169.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.46 : 1,900.50 = 780.48 : x
  2. Step 2: Convert to fraction form
    1,268.46/1,900.50 = 780.48/x
  3. Step 3: Cross multiply
    1,268.46x = 1,900.50 × 780.48
  4. Step 4: Simplify right side
    1,268.46x = 1,483,302.24
  5. Step 5: Solve for x
    x = 1,483,302.24/1,268.46
  6. Step 6: Final answer
    x = 1,169.37

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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.