Home / 1,139.20-1,570.80-1,022.56

Finding the Fourth Proportional to 1,139.20, 1,570.80 and 1,022.56

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Solution

The fourth proportional to 1,139.20, 1,570.80 and 1,022.56 is: 1,409.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.20 : 1,570.80 = 1,022.56 : x
  2. Step 2: Convert to fraction form
    1,139.20/1,570.80 = 1,022.56/x
  3. Step 3: Cross multiply
    1,139.20x = 1,570.80 × 1,022.56
  4. Step 4: Simplify right side
    1,139.20x = 1,606,237.25
  5. Step 5: Solve for x
    x = 1,606,237.25/1,139.20
  6. Step 6: Final answer
    x = 1,409.97

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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.