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Finding the Fourth Proportional to 386.98, 533.95 and 221.19

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Solution

The fourth proportional to 386.98, 533.95 and 221.19 is: 305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.98 : 533.95 = 221.19 : x
  2. Step 2: Convert to fraction form
    386.98/533.95 = 221.19/x
  3. Step 3: Cross multiply
    386.98x = 533.95 × 221.19
  4. Step 4: Simplify right side
    386.98x = 118,103.78
  5. Step 5: Solve for x
    x = 118,103.78/386.98
  6. Step 6: Final answer
    x = 305.20

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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.