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Finding the Fourth Proportional to 287.28, 394.61 and 283.23

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Solution

The fourth proportional to 287.28, 394.61 and 283.23 is: 389.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.28 : 394.61 = 283.23 : x
  2. Step 2: Convert to fraction form
    287.28/394.61 = 283.23/x
  3. Step 3: Cross multiply
    287.28x = 394.61 × 283.23
  4. Step 4: Simplify right side
    287.28x = 111,763.97
  5. Step 5: Solve for x
    x = 111,763.97/287.28
  6. Step 6: Final answer
    x = 389.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.