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Finding the Fourth Proportional to 259,660.80, 389,462.40 and 72,691.20

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Solution

The fourth proportional to 259,660.80, 389,462.40 and 72,691.20 is: 109,028.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,660.80 : 389,462.40 = 72,691.20 : x
  2. Step 2: Convert to fraction form
    259,660.80/389,462.40 = 72,691.20/x
  3. Step 3: Cross multiply
    259,660.80x = 389,462.40 × 72,691.20
  4. Step 4: Simplify right side
    259,660.80x = 28,310,489,210.88
  5. Step 5: Solve for x
    x = 28,310,489,210.88/259,660.80
  6. Step 6: Final answer
    x = 109,028.74

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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.