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Finding the Fourth Proportional to 170,761.70, 256,142.55 and 81,993.80

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Solution

The fourth proportional to 170,761.70, 256,142.55 and 81,993.80 is: 122,990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,761.70 : 256,142.55 = 81,993.80 : x
  2. Step 2: Convert to fraction form
    170,761.70/256,142.55 = 81,993.80/x
  3. Step 3: Cross multiply
    170,761.70x = 256,142.55 × 81,993.80
  4. Step 4: Simplify right side
    170,761.70x = 21,002,101,016.19
  5. Step 5: Solve for x
    x = 21,002,101,016.19/170,761.70
  6. Step 6: Final answer
    x = 122,990.70

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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.