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Finding the Fourth Proportional to 21,809.76, 32,724.32 and 7,955.52

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Solution

The fourth proportional to 21,809.76, 32,724.32 and 7,955.52 is: 11,936.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,809.76 : 32,724.32 = 7,955.52 : x
  2. Step 2: Convert to fraction form
    21,809.76/32,724.32 = 7,955.52/x
  3. Step 3: Cross multiply
    21,809.76x = 32,724.32 × 7,955.52
  4. Step 4: Simplify right side
    21,809.76x = 260,338,982.25
  5. Step 5: Solve for x
    x = 260,338,982.25/21,809.76
  6. Step 6: Final answer
    x = 11,936.81

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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.