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Finding the Fourth Proportional to 306.72, 423.26 and 257.48

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Solution

The fourth proportional to 306.72, 423.26 and 257.48 is: 355.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.72 : 423.26 = 257.48 : x
  2. Step 2: Convert to fraction form
    306.72/423.26 = 257.48/x
  3. Step 3: Cross multiply
    306.72x = 423.26 × 257.48
  4. Step 4: Simplify right side
    306.72x = 108,980.98
  5. Step 5: Solve for x
    x = 108,980.98/306.72
  6. Step 6: Final answer
    x = 355.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.