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Finding the Fourth Proportional to 1,408.47, 1,943.67 and 779.01

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Solution

The fourth proportional to 1,408.47, 1,943.67 and 779.01 is: 1,075.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.47 : 1,943.67 = 779.01 : x
  2. Step 2: Convert to fraction form
    1,408.47/1,943.67 = 779.01/x
  3. Step 3: Cross multiply
    1,408.47x = 1,943.67 × 779.01
  4. Step 4: Simplify right side
    1,408.47x = 1,514,138.37
  5. Step 5: Solve for x
    x = 1,514,138.37/1,408.47
  6. Step 6: Final answer
    x = 1,075.02

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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.