Home / 1,086.49-1,629.40-393.07

Finding the Fourth Proportional to 1,086.49, 1,629.40 and 393.07

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Solution

The fourth proportional to 1,086.49, 1,629.40 and 393.07 is: 589.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.49 : 1,629.40 = 393.07 : x
  2. Step 2: Convert to fraction form
    1,086.49/1,629.40 = 393.07/x
  3. Step 3: Cross multiply
    1,086.49x = 1,629.40 × 393.07
  4. Step 4: Simplify right side
    1,086.49x = 640,468.26
  5. Step 5: Solve for x
    x = 640,468.26/1,086.49
  6. Step 6: Final answer
    x = 589.48

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Double scale
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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.