Home / 260,979.20-391,430.40-74,009.60

Finding the Fourth Proportional to 260,979.20, 391,430.40 and 74,009.60

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Solution

The fourth proportional to 260,979.20, 391,430.40 and 74,009.60 is: 111,003.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,979.20 : 391,430.40 = 74,009.60 : x
  2. Step 2: Convert to fraction form
    260,979.20/391,430.40 = 74,009.60/x
  3. Step 3: Cross multiply
    260,979.20x = 391,430.40 × 74,009.60
  4. Step 4: Simplify right side
    260,979.20x = 28,969,607,331.84
  5. Step 5: Solve for x
    x = 28,969,607,331.84/260,979.20
  6. Step 6: Final answer
    x = 111,003.51

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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.