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Finding the Fourth Proportional to 259,449.61, 389,286.81 and 139,366.45

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Solution

The fourth proportional to 259,449.61, 389,286.81 and 139,366.45 is: 209,110.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,449.61 : 389,286.81 = 139,366.45 : x
  2. Step 2: Convert to fraction form
    259,449.61/389,286.81 = 139,366.45/x
  3. Step 3: Cross multiply
    259,449.61x = 389,286.81 × 139,366.45
  4. Step 4: Simplify right side
    259,449.61x = 54,253,518,460.57
  5. Step 5: Solve for x
    x = 54,253,518,460.57/259,449.61
  6. Step 6: Final answer
    x = 209,110.04

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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.