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Finding the Fourth Proportional to 289.44, 398.88 and 282.24

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Solution

The fourth proportional to 289.44, 398.88 and 282.24 is: 388.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.44 : 398.88 = 282.24 : x
  2. Step 2: Convert to fraction form
    289.44/398.88 = 282.24/x
  3. Step 3: Cross multiply
    289.44x = 398.88 × 282.24
  4. Step 4: Simplify right side
    289.44x = 112,579.89
  5. Step 5: Solve for x
    x = 112,579.89/289.44
  6. Step 6: Final answer
    x = 388.96

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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.