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Finding the Fourth Proportional to 238.99, 359.30 and 221.17

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Solution

The fourth proportional to 238.99, 359.30 and 221.17 is: 332.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.99 : 359.30 = 221.17 : x
  2. Step 2: Convert to fraction form
    238.99/359.30 = 221.17/x
  3. Step 3: Cross multiply
    238.99x = 359.30 × 221.17
  4. Step 4: Simplify right side
    238.99x = 79,465.28
  5. Step 5: Solve for x
    x = 79,465.28/238.99
  6. Step 6: Final answer
    x = 332.50

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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.