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Finding the Fourth Proportional to 279.72, 420.66 and 255.96

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Solution

The fourth proportional to 279.72, 420.66 and 255.96 is: 384.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.72 : 420.66 = 255.96 : x
  2. Step 2: Convert to fraction form
    279.72/420.66 = 255.96/x
  3. Step 3: Cross multiply
    279.72x = 420.66 × 255.96
  4. Step 4: Simplify right side
    279.72x = 107,672.13
  5. Step 5: Solve for x
    x = 107,672.13/279.72
  6. Step 6: Final answer
    x = 384.93

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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.