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Finding the Fourth Proportional to 259,308.50, 389,028.39 and 72,320

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Solution

The fourth proportional to 259,308.50, 389,028.39 and 72,320 is: 108,498.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,308.50 : 389,028.39 = 72,320 : x
  2. Step 2: Convert to fraction form
    259,308.50/389,028.39 = 72,320/x
  3. Step 3: Cross multiply
    259,308.50x = 389,028.39 × 72,320
  4. Step 4: Simplify right side
    259,308.50x = 28,134,533,164.80
  5. Step 5: Solve for x
    x = 28,134,533,164.80/259,308.50
  6. Step 6: Final answer
    x = 108,498.31

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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.