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Finding the Fourth Proportional to 386.59, 579.39 and 247.71

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Solution

The fourth proportional to 386.59, 579.39 and 247.71 is: 371.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.59 : 579.39 = 247.71 : x
  2. Step 2: Convert to fraction form
    386.59/579.39 = 247.71/x
  3. Step 3: Cross multiply
    386.59x = 579.39 × 247.71
  4. Step 4: Simplify right side
    386.59x = 143,520.70
  5. Step 5: Solve for x
    x = 143,520.70/386.59
  6. Step 6: Final answer
    x = 371.25

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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.