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Finding the Fourth Proportional to 388.26, 579.15 and 330.84

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Solution

The fourth proportional to 388.26, 579.15 and 330.84 is: 493.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.26 : 579.15 = 330.84 : x
  2. Step 2: Convert to fraction form
    388.26/579.15 = 330.84/x
  3. Step 3: Cross multiply
    388.26x = 579.15 × 330.84
  4. Step 4: Simplify right side
    388.26x = 191,605.99
  5. Step 5: Solve for x
    x = 191,605.99/388.26
  6. Step 6: Final answer
    x = 493.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.