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Finding the Fourth Proportional to 287.64, 431.04 and 191.28

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Solution

The fourth proportional to 287.64, 431.04 and 191.28 is: 286.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.64 : 431.04 = 191.28 : x
  2. Step 2: Convert to fraction form
    287.64/431.04 = 191.28/x
  3. Step 3: Cross multiply
    287.64x = 431.04 × 191.28
  4. Step 4: Simplify right side
    287.64x = 82,449.33
  5. Step 5: Solve for x
    x = 82,449.33/287.64
  6. Step 6: Final answer
    x = 286.64

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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.