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Finding the Fourth Proportional to 85,960.20, 128,940.30 and 71,185.80

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Solution

The fourth proportional to 85,960.20, 128,940.30 and 71,185.80 is: 106,778.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,960.20 : 128,940.30 = 71,185.80 : x
  2. Step 2: Convert to fraction form
    85,960.20/128,940.30 = 71,185.80/x
  3. Step 3: Cross multiply
    85,960.20x = 128,940.30 × 71,185.80
  4. Step 4: Simplify right side
    85,960.20x = 9,178,718,407.74
  5. Step 5: Solve for x
    x = 9,178,718,407.74/85,960.20
  6. Step 6: Final answer
    x = 106,778.70

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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.