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Finding the Fourth Proportional to 81,843.10, 122,764.65 and 72,001.60

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Solution

The fourth proportional to 81,843.10, 122,764.65 and 72,001.60 is: 108,002.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,843.10 : 122,764.65 = 72,001.60 : x
  2. Step 2: Convert to fraction form
    81,843.10/122,764.65 = 72,001.60/x
  3. Step 3: Cross multiply
    81,843.10x = 122,764.65 × 72,001.60
  4. Step 4: Simplify right side
    81,843.10x = 8,839,251,223.44
  5. Step 5: Solve for x
    x = 8,839,251,223.44/81,843.10
  6. Step 6: Final answer
    x = 108,002.40

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1.5x scale

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.