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Finding the Fourth Proportional to 386.40, 579.76 and 203.96

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Solution

The fourth proportional to 386.40, 579.76 and 203.96 is: 306.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.40 : 579.76 = 203.96 : x
  2. Step 2: Convert to fraction form
    386.40/579.76 = 203.96/x
  3. Step 3: Cross multiply
    386.40x = 579.76 × 203.96
  4. Step 4: Simplify right side
    386.40x = 118,247.85
  5. Step 5: Solve for x
    x = 118,247.85/386.40
  6. Step 6: Final answer
    x = 306.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.