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Finding the Fourth Proportional to 1,296.80, 1,936.40 and 1,019.78

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Solution

The fourth proportional to 1,296.80, 1,936.40 and 1,019.78 is: 1,522.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.80 : 1,936.40 = 1,019.78 : x
  2. Step 2: Convert to fraction form
    1,296.80/1,936.40 = 1,019.78/x
  3. Step 3: Cross multiply
    1,296.80x = 1,936.40 × 1,019.78
  4. Step 4: Simplify right side
    1,296.80x = 1,974,701.99
  5. Step 5: Solve for x
    x = 1,974,701.99/1,296.80
  6. Step 6: Final answer
    x = 1,522.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.