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Finding the Third Proportional to 3,955.50 and 4,239

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Solution

The third proportional to 3,955.50 and 4,239 is: 4,542.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,955.50 : 4,239 = 4,239 : x
  2. Step 2: Convert to fraction form
    3,955.50/4,239 = 4,239/x
  3. Step 3: Cross multiply
    3,955.50x = 4,239 × 4,239
  4. Step 4: Simplify right side
    3,955.50x = 17,969,121
  5. Step 5: Solve for x
    x = 17,969,121/3,955.50
  6. Step 6: Final answer
    x = 4,542.82

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.