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Finding the Fourth Proportional to 386.74, 533.70 and 221.00

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Solution

The fourth proportional to 386.74, 533.70 and 221.00 is: 304.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.74 : 533.70 = 221.00 : x
  2. Step 2: Convert to fraction form
    386.74/533.70 = 221.00/x
  3. Step 3: Cross multiply
    386.74x = 533.70 × 221.00
  4. Step 4: Simplify right side
    386.74x = 117,945.03
  5. Step 5: Solve for x
    x = 117,945.03/386.74
  6. Step 6: Final answer
    x = 304.97

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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.