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Finding the Fourth Proportional to 386.80, 533.92 and 229.52

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Solution

The fourth proportional to 386.80, 533.92 and 229.52 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.80 : 533.92 = 229.52 : x
  2. Step 2: Convert to fraction form
    386.80/533.92 = 229.52/x
  3. Step 3: Cross multiply
    386.80x = 533.92 × 229.52
  4. Step 4: Simplify right side
    386.80x = 122,545.32
  5. Step 5: Solve for x
    x = 122,545.32/386.80
  6. Step 6: Final answer
    x = 316.82

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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.