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Finding the Fourth Proportional to 81,172.80, 121,778.40 and 25,768.80

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Solution

The fourth proportional to 81,172.80, 121,778.40 and 25,768.80 is: 38,659.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,172.80 : 121,778.40 = 25,768.80 : x
  2. Step 2: Convert to fraction form
    81,172.80/121,778.40 = 25,768.80/x
  3. Step 3: Cross multiply
    81,172.80x = 121,778.40 × 25,768.80
  4. Step 4: Simplify right side
    81,172.80x = 3,138,083,233.92
  5. Step 5: Solve for x
    x = 3,138,083,233.92/81,172.80
  6. Step 6: Final answer
    x = 38,659.30

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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.