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Finding the Fourth Proportional to 384.97, 531.31 and 216.99

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Solution

The fourth proportional to 384.97, 531.31 and 216.99 is: 299.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.97 : 531.31 = 216.99 : x
  2. Step 2: Convert to fraction form
    384.97/531.31 = 216.99/x
  3. Step 3: Cross multiply
    384.97x = 531.31 × 216.99
  4. Step 4: Simplify right side
    384.97x = 115,288.96
  5. Step 5: Solve for x
    x = 115,288.96/384.97
  6. Step 6: Final answer
    x = 299.48

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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.