Home / 1,420.28-1,958.36-1,139.60

Finding the Fourth Proportional to 1,420.28, 1,958.36 and 1,139.60

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Solution

The fourth proportional to 1,420.28, 1,958.36 and 1,139.60 is: 1,571.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.28 : 1,958.36 = 1,139.60 : x
  2. Step 2: Convert to fraction form
    1,420.28/1,958.36 = 1,139.60/x
  3. Step 3: Cross multiply
    1,420.28x = 1,958.36 × 1,139.60
  4. Step 4: Simplify right side
    1,420.28x = 2,231,747.06
  5. Step 5: Solve for x
    x = 2,231,747.06/1,420.28
  6. Step 6: Final answer
    x = 1,571.34

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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.