Home / 1,087.31-1,629.95-393.54

Finding the Fourth Proportional to 1,087.31, 1,629.95 and 393.54

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Solution

The fourth proportional to 1,087.31, 1,629.95 and 393.54 is: 589.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.31 : 1,629.95 = 393.54 : x
  2. Step 2: Convert to fraction form
    1,087.31/1,629.95 = 393.54/x
  3. Step 3: Cross multiply
    1,087.31x = 1,629.95 × 393.54
  4. Step 4: Simplify right side
    1,087.31x = 641,448.56
  5. Step 5: Solve for x
    x = 641,448.56/1,087.31
  6. Step 6: Final answer
    x = 589.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.