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Finding the Fourth Proportional to 279.92, 419.36 and 142.96

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Solution

The fourth proportional to 279.92, 419.36 and 142.96 is: 214.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.92 : 419.36 = 142.96 : x
  2. Step 2: Convert to fraction form
    279.92/419.36 = 142.96/x
  3. Step 3: Cross multiply
    279.92x = 419.36 × 142.96
  4. Step 4: Simplify right side
    279.92x = 59,951.71
  5. Step 5: Solve for x
    x = 59,951.71/279.92
  6. Step 6: Final answer
    x = 214.17

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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.