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Finding the Fourth Proportional to 127,981.20, 191,971.80 and 85,990.80

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Solution

The fourth proportional to 127,981.20, 191,971.80 and 85,990.80 is: 128,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,981.20 : 191,971.80 = 85,990.80 : x
  2. Step 2: Convert to fraction form
    127,981.20/191,971.80 = 85,990.80/x
  3. Step 3: Cross multiply
    127,981.20x = 191,971.80 × 85,990.80
  4. Step 4: Simplify right side
    127,981.20x = 16,507,808,659.44
  5. Step 5: Solve for x
    x = 16,507,808,659.44/127,981.20
  6. Step 6: Final answer
    x = 128,986.20

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Similar ratio
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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.