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Finding the Fourth Proportional to 279.63, 419.10 and 142.71

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Solution

The fourth proportional to 279.63, 419.10 and 142.71 is: 213.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.63 : 419.10 = 142.71 : x
  2. Step 2: Convert to fraction form
    279.63/419.10 = 142.71/x
  3. Step 3: Cross multiply
    279.63x = 419.10 × 142.71
  4. Step 4: Simplify right side
    279.63x = 59,809.76
  5. Step 5: Solve for x
    x = 59,809.76/279.63
  6. Step 6: Final answer
    x = 213.89

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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.