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Finding the Fourth Proportional to 286.49, 427.56 and 279.20

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Solution

The fourth proportional to 286.49, 427.56 and 279.20 is: 416.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.49 : 427.56 = 279.20 : x
  2. Step 2: Convert to fraction form
    286.49/427.56 = 279.20/x
  3. Step 3: Cross multiply
    286.49x = 427.56 × 279.20
  4. Step 4: Simplify right side
    286.49x = 119,374.75
  5. Step 5: Solve for x
    x = 119,374.75/286.49
  6. Step 6: Final answer
    x = 416.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.