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Finding the Fourth Proportional to 279.96, 420.72 and 193.56

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Solution

The fourth proportional to 279.96, 420.72 and 193.56 is: 290.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.96 : 420.72 = 193.56 : x
  2. Step 2: Convert to fraction form
    279.96/420.72 = 193.56/x
  3. Step 3: Cross multiply
    279.96x = 420.72 × 193.56
  4. Step 4: Simplify right side
    279.96x = 81,434.56
  5. Step 5: Solve for x
    x = 81,434.56/279.96
  6. Step 6: Final answer
    x = 290.88

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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.