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Finding the Fourth Proportional to 1,408.97, 1,944.40 and 779.55

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Solution

The fourth proportional to 1,408.97, 1,944.40 and 779.55 is: 1,075.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.97 : 1,944.40 = 779.55 : x
  2. Step 2: Convert to fraction form
    1,408.97/1,944.40 = 779.55/x
  3. Step 3: Cross multiply
    1,408.97x = 1,944.40 × 779.55
  4. Step 4: Simplify right side
    1,408.97x = 1,515,755.07
  5. Step 5: Solve for x
    x = 1,515,755.07/1,408.97
  6. Step 6: Final answer
    x = 1,075.79

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1.5x scale

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.