Home / 1,399.16-1,930.52-839.45

Finding the Fourth Proportional to 1,399.16, 1,930.52 and 839.45

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Solution

The fourth proportional to 1,399.16, 1,930.52 and 839.45 is: 1,158.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.16 : 1,930.52 = 839.45 : x
  2. Step 2: Convert to fraction form
    1,399.16/1,930.52 = 839.45/x
  3. Step 3: Cross multiply
    1,399.16x = 1,930.52 × 839.45
  4. Step 4: Simplify right side
    1,399.16x = 1,620,561.16
  5. Step 5: Solve for x
    x = 1,620,561.16/1,399.16
  6. Step 6: Final answer
    x = 1,158.24

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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.