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Finding the Fourth Proportional to 287.16, 396 and 283.08

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Solution

The fourth proportional to 287.16, 396 and 283.08 is: 390.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.16 : 396 = 283.08 : x
  2. Step 2: Convert to fraction form
    287.16/396 = 283.08/x
  3. Step 3: Cross multiply
    287.16x = 396 × 283.08
  4. Step 4: Simplify right side
    287.16x = 112,099.68
  5. Step 5: Solve for x
    x = 112,099.68/287.16
  6. Step 6: Final answer
    x = 390.37

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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.