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Finding the Third Proportional to 390.25 and 584.38

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Solution

The third proportional to 390.25 and 584.38 is: 875.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.25 : 584.38 = 584.38 : x
  2. Step 2: Convert to fraction form
    390.25/584.38 = 584.38/x
  3. Step 3: Cross multiply
    390.25x = 584.38 × 584.38
  4. Step 4: Simplify right side
    390.25x = 341,494.14
  5. Step 5: Solve for x
    x = 341,494.14/390.25
  6. Step 6: Final answer
    x = 875.07

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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.