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Finding the Fourth Proportional to 386.05, 579.45 and 328.85

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Solution

The fourth proportional to 386.05, 579.45 and 328.85 is: 493.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.05 : 579.45 = 328.85 : x
  2. Step 2: Convert to fraction form
    386.05/579.45 = 328.85/x
  3. Step 3: Cross multiply
    386.05x = 579.45 × 328.85
  4. Step 4: Simplify right side
    386.05x = 190,552.13
  5. Step 5: Solve for x
    x = 190,552.13/386.05
  6. Step 6: Final answer
    x = 493.60

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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.