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Finding the Fourth Proportional to 205,039.20, 307,558.80 and 120,712.80

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Solution

The fourth proportional to 205,039.20, 307,558.80 and 120,712.80 is: 181,069.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,039.20 : 307,558.80 = 120,712.80 : x
  2. Step 2: Convert to fraction form
    205,039.20/307,558.80 = 120,712.80/x
  3. Step 3: Cross multiply
    205,039.20x = 307,558.80 × 120,712.80
  4. Step 4: Simplify right side
    205,039.20x = 37,126,283,912.64
  5. Step 5: Solve for x
    x = 37,126,283,912.64/205,039.20
  6. Step 6: Final answer
    x = 181,069.20

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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.