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Finding the Fourth Proportional to 320.28, 441.63 and 257.91

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Solution

The fourth proportional to 320.28, 441.63 and 257.91 is: 355.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.28 : 441.63 = 257.91 : x
  2. Step 2: Convert to fraction form
    320.28/441.63 = 257.91/x
  3. Step 3: Cross multiply
    320.28x = 441.63 × 257.91
  4. Step 4: Simplify right side
    320.28x = 113,900.79
  5. Step 5: Solve for x
    x = 113,900.79/320.28
  6. Step 6: Final answer
    x = 355.63

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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.