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Finding the Fourth Proportional to 381.39, 572.78 and 339.02

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Solution

The fourth proportional to 381.39, 572.78 and 339.02 is: 509.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.39 : 572.78 = 339.02 : x
  2. Step 2: Convert to fraction form
    381.39/572.78 = 339.02/x
  3. Step 3: Cross multiply
    381.39x = 572.78 × 339.02
  4. Step 4: Simplify right side
    381.39x = 194,183.88
  5. Step 5: Solve for x
    x = 194,183.88/381.39
  6. Step 6: Final answer
    x = 509.15

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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.