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Finding the Fourth Proportional to 127,971.90, 192,115.80 and 80,586.90

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Solution

The fourth proportional to 127,971.90, 192,115.80 and 80,586.90 is: 120,979.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,971.90 : 192,115.80 = 80,586.90 : x
  2. Step 2: Convert to fraction form
    127,971.90/192,115.80 = 80,586.90/x
  3. Step 3: Cross multiply
    127,971.90x = 192,115.80 × 80,586.90
  4. Step 4: Simplify right side
    127,971.90x = 15,482,016,763.02
  5. Step 5: Solve for x
    x = 15,482,016,763.02/127,971.90
  6. Step 6: Final answer
    x = 120,979.81

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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.