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Finding the Fourth Proportional to 81,816.20, 122,724.30 and 26,412.20

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Solution

The fourth proportional to 81,816.20, 122,724.30 and 26,412.20 is: 39,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,816.20 : 122,724.30 = 26,412.20 : x
  2. Step 2: Convert to fraction form
    81,816.20/122,724.30 = 26,412.20/x
  3. Step 3: Cross multiply
    81,816.20x = 122,724.30 × 26,412.20
  4. Step 4: Simplify right side
    81,816.20x = 3,241,418,756.46
  5. Step 5: Solve for x
    x = 3,241,418,756.46/81,816.20
  6. Step 6: Final answer
    x = 39,618.30

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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.