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Finding the Fourth Proportional to 387.69, 579.65 and 330.59

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Solution

The fourth proportional to 387.69, 579.65 and 330.59 is: 494.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.69 : 579.65 = 330.59 : x
  2. Step 2: Convert to fraction form
    387.69/579.65 = 330.59/x
  3. Step 3: Cross multiply
    387.69x = 579.65 × 330.59
  4. Step 4: Simplify right side
    387.69x = 191,621.94
  5. Step 5: Solve for x
    x = 191,621.94/387.69
  6. Step 6: Final answer
    x = 494.27

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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.