Home / 1,028.50-1,421.30-779.37

Finding the Fourth Proportional to 1,028.50, 1,421.30 and 779.37

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Solution

The fourth proportional to 1,028.50, 1,421.30 and 779.37 is: 1,077.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.50 : 1,421.30 = 779.37 : x
  2. Step 2: Convert to fraction form
    1,028.50/1,421.30 = 779.37/x
  3. Step 3: Cross multiply
    1,028.50x = 1,421.30 × 779.37
  4. Step 4: Simplify right side
    1,028.50x = 1,107,718.81
  5. Step 5: Solve for x
    x = 1,107,718.81/1,028.50
  6. Step 6: Final answer
    x = 1,077.03

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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.