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Finding the Third Proportional to 399.75 and 865.88

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Solution

The third proportional to 399.75 and 865.88 is: 1,875.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.75 : 865.88 = 865.88 : x
  2. Step 2: Convert to fraction form
    399.75/865.88 = 865.88/x
  3. Step 3: Cross multiply
    399.75x = 865.88 × 865.88
  4. Step 4: Simplify right side
    399.75x = 749,739.52
  5. Step 5: Solve for x
    x = 749,739.52/399.75
  6. Step 6: Final answer
    x = 1,875.52

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.