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Finding the Fourth Proportional to 1,086.42, 1,629.84 and 393.12

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Solution

The fourth proportional to 1,086.42, 1,629.84 and 393.12 is: 589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.42 : 1,629.84 = 393.12 : x
  2. Step 2: Convert to fraction form
    1,086.42/1,629.84 = 393.12/x
  3. Step 3: Cross multiply
    1,086.42x = 1,629.84 × 393.12
  4. Step 4: Simplify right side
    1,086.42x = 640,722.70
  5. Step 5: Solve for x
    x = 640,722.70/1,086.42
  6. Step 6: Final answer
    x = 589.76

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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.