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Finding the Fourth Proportional to 57,720.64, 86,353.20 and 43,721.04

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Solution

The fourth proportional to 57,720.64, 86,353.20 and 43,721.04 is: 65,409.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,720.64 : 86,353.20 = 43,721.04 : x
  2. Step 2: Convert to fraction form
    57,720.64/86,353.20 = 43,721.04/x
  3. Step 3: Cross multiply
    57,720.64x = 86,353.20 × 43,721.04
  4. Step 4: Simplify right side
    57,720.64x = 3,775,451,711.33
  5. Step 5: Solve for x
    x = 3,775,451,711.33/57,720.64
  6. Step 6: Final answer
    x = 65,409.04

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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.