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Finding the Fourth Proportional to 386.86, 533.92 and 221.04

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Solution

The fourth proportional to 386.86, 533.92 and 221.04 is: 305.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.86 : 533.92 = 221.04 : x
  2. Step 2: Convert to fraction form
    386.86/533.92 = 221.04/x
  3. Step 3: Cross multiply
    386.86x = 533.92 × 221.04
  4. Step 4: Simplify right side
    386.86x = 118,017.68
  5. Step 5: Solve for x
    x = 118,017.68/386.86
  6. Step 6: Final answer
    x = 305.07

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.