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Finding the Fourth Proportional to 328.77, 493.29 and 257.22

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Solution

The fourth proportional to 328.77, 493.29 and 257.22 is: 385.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.77 : 493.29 = 257.22 : x
  2. Step 2: Convert to fraction form
    328.77/493.29 = 257.22/x
  3. Step 3: Cross multiply
    328.77x = 493.29 × 257.22
  4. Step 4: Simplify right side
    328.77x = 126,884.05
  5. Step 5: Solve for x
    x = 126,884.05/328.77
  6. Step 6: Final answer
    x = 385.94

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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.