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Finding the Fourth Proportional to 170,740.70, 256,111.05 and 81,972.80

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Solution

The fourth proportional to 170,740.70, 256,111.05 and 81,972.80 is: 122,959.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,740.70 : 256,111.05 = 81,972.80 : x
  2. Step 2: Convert to fraction form
    170,740.70/256,111.05 = 81,972.80/x
  3. Step 3: Cross multiply
    170,740.70x = 256,111.05 × 81,972.80
  4. Step 4: Simplify right side
    170,740.70x = 20,994,139,879.44
  5. Step 5: Solve for x
    x = 20,994,139,879.44/170,740.70
  6. Step 6: Final answer
    x = 122,959.20

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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.