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Finding the Fourth Proportional to 1,427.13, 1,969.41 and 797.70

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Solution

The fourth proportional to 1,427.13, 1,969.41 and 797.70 is: 1,100.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.13 : 1,969.41 = 797.70 : x
  2. Step 2: Convert to fraction form
    1,427.13/1,969.41 = 797.70/x
  3. Step 3: Cross multiply
    1,427.13x = 1,969.41 × 797.70
  4. Step 4: Simplify right side
    1,427.13x = 1,570,998.36
  5. Step 5: Solve for x
    x = 1,570,998.36/1,427.13
  6. Step 6: Final answer
    x = 1,100.81

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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.