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Finding the Fourth Proportional to 81,722.20, 122,612.10 and 78,842.20

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Solution

The fourth proportional to 81,722.20, 122,612.10 and 78,842.20 is: 118,291.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,722.20 : 122,612.10 = 78,842.20 : x
  2. Step 2: Convert to fraction form
    81,722.20/122,612.10 = 78,842.20/x
  3. Step 3: Cross multiply
    81,722.20x = 122,612.10 × 78,842.20
  4. Step 4: Simplify right side
    81,722.20x = 9,667,007,710.62
  5. Step 5: Solve for x
    x = 9,667,007,710.62/81,722.20
  6. Step 6: Final answer
    x = 118,291.09

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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.