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Finding the Third Proportional to 399.38 and 587.63

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Solution

The third proportional to 399.38 and 587.63 is: 864.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 587.63 = 587.63 : x
  2. Step 2: Convert to fraction form
    399.38/587.63 = 587.63/x
  3. Step 3: Cross multiply
    399.38x = 587.63 × 587.63
  4. Step 4: Simplify right side
    399.38x = 345,303.14
  5. Step 5: Solve for x
    x = 345,303.14/399.38
  6. Step 6: Final answer
    x = 864.61

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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.