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Finding the Fourth Proportional to 279.86, 420.42 and 239.82

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Solution

The fourth proportional to 279.86, 420.42 and 239.82 is: 360.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 420.42 = 239.82 : x
  2. Step 2: Convert to fraction form
    279.86/420.42 = 239.82/x
  3. Step 3: Cross multiply
    279.86x = 420.42 × 239.82
  4. Step 4: Simplify right side
    279.86x = 100,825.12
  5. Step 5: Solve for x
    x = 100,825.12/279.86
  6. Step 6: Final answer
    x = 360.27

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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.