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Finding the Fourth Proportional to 260,012.80, 389,990.40 and 73,043.20

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Solution

The fourth proportional to 260,012.80, 389,990.40 and 73,043.20 is: 109,556.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,012.80 : 389,990.40 = 73,043.20 : x
  2. Step 2: Convert to fraction form
    260,012.80/389,990.40 = 73,043.20/x
  3. Step 3: Cross multiply
    260,012.80x = 389,990.40 × 73,043.20
  4. Step 4: Simplify right side
    260,012.80x = 28,486,146,785.28
  5. Step 5: Solve for x
    x = 28,486,146,785.28/260,012.80
  6. Step 6: Final answer
    x = 109,556.71

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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.