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Finding the Fourth Proportional to 57,968.64, 86,991.84 and 20,528.64

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Solution

The fourth proportional to 57,968.64, 86,991.84 and 20,528.64 is: 30,806.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,968.64 : 86,991.84 = 20,528.64 : x
  2. Step 2: Convert to fraction form
    57,968.64/86,991.84 = 20,528.64/x
  3. Step 3: Cross multiply
    57,968.64x = 86,991.84 × 20,528.64
  4. Step 4: Simplify right side
    57,968.64x = 1,785,824,166.30
  5. Step 5: Solve for x
    x = 1,785,824,166.30/57,968.64
  6. Step 6: Final answer
    x = 30,806.73

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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.