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Finding the Fourth Proportional to 121,379.20, 181,971.60 and 51,200.80

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Solution

The fourth proportional to 121,379.20, 181,971.60 and 51,200.80 is: 76,760.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,379.20 : 181,971.60 = 51,200.80 : x
  2. Step 2: Convert to fraction form
    121,379.20/181,971.60 = 51,200.80/x
  3. Step 3: Cross multiply
    121,379.20x = 181,971.60 × 51,200.80
  4. Step 4: Simplify right side
    121,379.20x = 9,317,091,497.28
  5. Step 5: Solve for x
    x = 9,317,091,497.28/121,379.20
  6. Step 6: Final answer
    x = 76,760.20

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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.