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Finding the Third Proportional to 399.78 and 862.84

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Solution

The third proportional to 399.78 and 862.84 is: 1,862.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.78 : 862.84 = 862.84 : x
  2. Step 2: Convert to fraction form
    399.78/862.84 = 862.84/x
  3. Step 3: Cross multiply
    399.78x = 862.84 × 862.84
  4. Step 4: Simplify right side
    399.78x = 744,492.60
  5. Step 5: Solve for x
    x = 744,492.60/399.78
  6. Step 6: Final answer
    x = 1,862.26

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.