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Finding the Fourth Proportional to 259,590.80, 389,357.40 and 72,621.20

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Solution

The fourth proportional to 259,590.80, 389,357.40 and 72,621.20 is: 108,923.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,590.80 : 389,357.40 = 72,621.20 : x
  2. Step 2: Convert to fraction form
    259,590.80/389,357.40 = 72,621.20/x
  3. Step 3: Cross multiply
    259,590.80x = 389,357.40 × 72,621.20
  4. Step 4: Simplify right side
    259,590.80x = 28,275,601,616.88
  5. Step 5: Solve for x
    x = 28,275,601,616.88/259,590.80
  6. Step 6: Final answer
    x = 108,923.74

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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.