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Finding the Fourth Proportional to 64,920, 97,380 and 21,144

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Solution

The fourth proportional to 64,920, 97,380 and 21,144 is: 31,716

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,920 : 97,380 = 21,144 : x
  2. Step 2: Convert to fraction form
    64,920/97,380 = 21,144/x
  3. Step 3: Cross multiply
    64,920x = 97,380 × 21,144
  4. Step 4: Simplify right side
    64,920x = 2,059,002,720
  5. Step 5: Solve for x
    x = 2,059,002,720/64,920
  6. Step 6: Final answer
    x = 31,716

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.