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Finding the Fourth Proportional to 1,278.03, 1,762.44 and 773.79

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Solution

The fourth proportional to 1,278.03, 1,762.44 and 773.79 is: 1,067.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.03 : 1,762.44 = 773.79 : x
  2. Step 2: Convert to fraction form
    1,278.03/1,762.44 = 773.79/x
  3. Step 3: Cross multiply
    1,278.03x = 1,762.44 × 773.79
  4. Step 4: Simplify right side
    1,278.03x = 1,363,758.45
  5. Step 5: Solve for x
    x = 1,363,758.45/1,278.03
  6. Step 6: Final answer
    x = 1,067.08

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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.