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Finding the Fourth Proportional to 43,720.32, 65,612.88 and 18,772.32

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Solution

The fourth proportional to 43,720.32, 65,612.88 and 18,772.32 is: 28,172.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,720.32 : 65,612.88 = 18,772.32 : x
  2. Step 2: Convert to fraction form
    43,720.32/65,612.88 = 18,772.32/x
  3. Step 3: Cross multiply
    43,720.32x = 65,612.88 × 18,772.32
  4. Step 4: Simplify right side
    43,720.32x = 1,231,705,979.48
  5. Step 5: Solve for x
    x = 1,231,705,979.48/43,720.32
  6. Step 6: Final answer
    x = 28,172.39

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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.