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Finding the Fourth Proportional to 386.72, 533.59 and 220.87

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Solution

The fourth proportional to 386.72, 533.59 and 220.87 is: 304.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.72 : 533.59 = 220.87 : x
  2. Step 2: Convert to fraction form
    386.72/533.59 = 220.87/x
  3. Step 3: Cross multiply
    386.72x = 533.59 × 220.87
  4. Step 4: Simplify right side
    386.72x = 117,854.02
  5. Step 5: Solve for x
    x = 117,854.02/386.72
  6. Step 6: Final answer
    x = 304.75

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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.