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Finding the Fourth Proportional to 386.93, 533.93 and 221.15

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Solution

The fourth proportional to 386.93, 533.93 and 221.15 is: 305.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.93 : 533.93 = 221.15 : x
  2. Step 2: Convert to fraction form
    386.93/533.93 = 221.15/x
  3. Step 3: Cross multiply
    386.93x = 533.93 × 221.15
  4. Step 4: Simplify right side
    386.93x = 118,074.84
  5. Step 5: Solve for x
    x = 118,074.84/386.93
  6. Step 6: Final answer
    x = 305.16

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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.