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Finding the Fourth Proportional to 386.61, 533.58 and 220.80

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Solution

The fourth proportional to 386.61, 533.58 and 220.80 is: 304.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.61 : 533.58 = 220.80 : x
  2. Step 2: Convert to fraction form
    386.61/533.58 = 220.80/x
  3. Step 3: Cross multiply
    386.61x = 533.58 × 220.80
  4. Step 4: Simplify right side
    386.61x = 117,814.46
  5. Step 5: Solve for x
    x = 117,814.46/386.61
  6. Step 6: Final answer
    x = 304.74

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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.