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Finding the Fourth Proportional to 427.21, 589.67 and 279.87

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Solution

The fourth proportional to 427.21, 589.67 and 279.87 is: 386.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.21 : 589.67 = 279.87 : x
  2. Step 2: Convert to fraction form
    427.21/589.67 = 279.87/x
  3. Step 3: Cross multiply
    427.21x = 589.67 × 279.87
  4. Step 4: Simplify right side
    427.21x = 165,028.38
  5. Step 5: Solve for x
    x = 165,028.38/427.21
  6. Step 6: Final answer
    x = 386.30

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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.