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Finding the Fourth Proportional to 43,842.40, 65,720.40 and 21,659.20

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Solution

The fourth proportional to 43,842.40, 65,720.40 and 21,659.20 is: 32,467.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,842.40 : 65,720.40 = 21,659.20 : x
  2. Step 2: Convert to fraction form
    43,842.40/65,720.40 = 21,659.20/x
  3. Step 3: Cross multiply
    43,842.40x = 65,720.40 × 21,659.20
  4. Step 4: Simplify right side
    43,842.40x = 1,423,451,287.68
  5. Step 5: Solve for x
    x = 1,423,451,287.68/43,842.40
  6. Step 6: Final answer
    x = 32,467.46

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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.