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Finding the Third Proportional to 39,408 and 85,728

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Solution

The third proportional to 39,408 and 85,728 is: 186,492.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,408 : 85,728 = 85,728 : x
  2. Step 2: Convert to fraction form
    39,408/85,728 = 85,728/x
  3. Step 3: Cross multiply
    39,408x = 85,728 × 85,728
  4. Step 4: Simplify right side
    39,408x = 7,349,289,984
  5. Step 5: Solve for x
    x = 7,349,289,984/39,408
  6. Step 6: Final answer
    x = 186,492.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.