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Finding the Fourth Proportional to 21,912, 32,868 and 7,320

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Solution

The fourth proportional to 21,912, 32,868 and 7,320 is: 10,980

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912 : 32,868 = 7,320 : x
  2. Step 2: Convert to fraction form
    21,912/32,868 = 7,320/x
  3. Step 3: Cross multiply
    21,912x = 32,868 × 7,320
  4. Step 4: Simplify right side
    21,912x = 240,593,760
  5. Step 5: Solve for x
    x = 240,593,760/21,912
  6. Step 6: Final answer
    x = 10,980

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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.