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Finding the Fourth Proportional to 381.47, 571.95 and 259.79

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Solution

The fourth proportional to 381.47, 571.95 and 259.79 is: 389.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.47 : 571.95 = 259.79 : x
  2. Step 2: Convert to fraction form
    381.47/571.95 = 259.79/x
  3. Step 3: Cross multiply
    381.47x = 571.95 × 259.79
  4. Step 4: Simplify right side
    381.47x = 148,584.03
  5. Step 5: Solve for x
    x = 148,584.03/381.47
  6. Step 6: Final answer
    x = 389.51

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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.