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Finding the Fourth Proportional to 170,755.70, 256,133.55 and 81,987.80

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Solution

The fourth proportional to 170,755.70, 256,133.55 and 81,987.80 is: 122,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,755.70 : 256,133.55 = 81,987.80 : x
  2. Step 2: Convert to fraction form
    170,755.70/256,133.55 = 81,987.80/x
  3. Step 3: Cross multiply
    170,755.70x = 256,133.55 × 81,987.80
  4. Step 4: Simplify right side
    170,755.70x = 20,999,826,270.69
  5. Step 5: Solve for x
    x = 20,999,826,270.69/170,755.70
  6. Step 6: Final answer
    x = 122,981.70

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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.