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Finding the Fourth Proportional to 21,712, 32,568 and 7,120

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Solution

The fourth proportional to 21,712, 32,568 and 7,120 is: 10,680

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,712 : 32,568 = 7,120 : x
  2. Step 2: Convert to fraction form
    21,712/32,568 = 7,120/x
  3. Step 3: Cross multiply
    21,712x = 32,568 × 7,120
  4. Step 4: Simplify right side
    21,712x = 231,884,160
  5. Step 5: Solve for x
    x = 231,884,160/21,712
  6. Step 6: Final answer
    x = 10,680

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Why These Related Problems?

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