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Finding the Fourth Proportional to 83,698.56, 125,548.05 and 20,518.97

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Solution

The fourth proportional to 83,698.56, 125,548.05 and 20,518.97 is: 30,778.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,698.56 : 125,548.05 = 20,518.97 : x
  2. Step 2: Convert to fraction form
    83,698.56/125,548.05 = 20,518.97/x
  3. Step 3: Cross multiply
    83,698.56x = 125,548.05 × 20,518.97
  4. Step 4: Simplify right side
    83,698.56x = 2,576,116,043.77
  5. Step 5: Solve for x
    x = 2,576,116,043.77/83,698.56
  6. Step 6: Final answer
    x = 30,778.50

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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.