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Finding the Fourth Proportional to 259,565.40, 389,348.10 and 257,815.80

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Solution

The fourth proportional to 259,565.40, 389,348.10 and 257,815.80 is: 386,723.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,565.40 : 389,348.10 = 257,815.80 : x
  2. Step 2: Convert to fraction form
    259,565.40/389,348.10 = 257,815.80/x
  3. Step 3: Cross multiply
    259,565.40x = 389,348.10 × 257,815.80
  4. Step 4: Simplify right side
    259,565.40x = 100,380,091,879.98
  5. Step 5: Solve for x
    x = 100,380,091,879.98/259,565.40
  6. Step 6: Final answer
    x = 386,723.70

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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.