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Finding the Fourth Proportional to 1,400.80, 1,933.20 and 779.68

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Solution

The fourth proportional to 1,400.80, 1,933.20 and 779.68 is: 1,076.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.80 : 1,933.20 = 779.68 : x
  2. Step 2: Convert to fraction form
    1,400.80/1,933.20 = 779.68/x
  3. Step 3: Cross multiply
    1,400.80x = 1,933.20 × 779.68
  4. Step 4: Simplify right side
    1,400.80x = 1,507,277.38
  5. Step 5: Solve for x
    x = 1,507,277.38/1,400.80
  6. Step 6: Final answer
    x = 1,076.01

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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.