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Finding the Fourth Proportional to 81,416.80, 122,125.20 and 57,797.20

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Solution

The fourth proportional to 81,416.80, 122,125.20 and 57,797.20 is: 86,695.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,416.80 : 122,125.20 = 57,797.20 : x
  2. Step 2: Convert to fraction form
    81,416.80/122,125.20 = 57,797.20/x
  3. Step 3: Cross multiply
    81,416.80x = 122,125.20 × 57,797.20
  4. Step 4: Simplify right side
    81,416.80x = 7,058,494,609.44
  5. Step 5: Solve for x
    x = 7,058,494,609.44/81,416.80
  6. Step 6: Final answer
    x = 86,695.80

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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.