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Finding the Third Proportional to 20,434 and 28,915

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Solution

The third proportional to 20,434 and 28,915 is: 40,915.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,434 : 28,915 = 28,915 : x
  2. Step 2: Convert to fraction form
    20,434/28,915 = 28,915/x
  3. Step 3: Cross multiply
    20,434x = 28,915 × 28,915
  4. Step 4: Simplify right side
    20,434x = 836,077,225
  5. Step 5: Solve for x
    x = 836,077,225/20,434
  6. Step 6: Final answer
    x = 40,915.98

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.