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Finding the Fourth Proportional to 387.20, 579.43 and 336.02

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Solution

The fourth proportional to 387.20, 579.43 and 336.02 is: 502.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.20 : 579.43 = 336.02 : x
  2. Step 2: Convert to fraction form
    387.20/579.43 = 336.02/x
  3. Step 3: Cross multiply
    387.20x = 579.43 × 336.02
  4. Step 4: Simplify right side
    387.20x = 194,700.07
  5. Step 5: Solve for x
    x = 194,700.07/387.20
  6. Step 6: Final answer
    x = 502.84

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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.