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Finding the Third Proportional to 399.38 and 585.75

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Solution

The third proportional to 399.38 and 585.75 is: 859.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 585.75 = 585.75 : x
  2. Step 2: Convert to fraction form
    399.38/585.75 = 585.75/x
  3. Step 3: Cross multiply
    399.38x = 585.75 × 585.75
  4. Step 4: Simplify right side
    399.38x = 343,103.06
  5. Step 5: Solve for x
    x = 343,103.06/399.38
  6. Step 6: Final answer
    x = 859.10

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.