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Finding the Fourth Proportional to 259,454.60, 389,145.45 and 81,979.55

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Solution

The fourth proportional to 259,454.60, 389,145.45 and 81,979.55 is: 122,957.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,454.60 : 389,145.45 = 81,979.55 : x
  2. Step 2: Convert to fraction form
    259,454.60/389,145.45 = 81,979.55/x
  3. Step 3: Cross multiply
    259,454.60x = 389,145.45 × 81,979.55
  4. Step 4: Simplify right side
    259,454.60x = 31,901,968,875.55
  5. Step 5: Solve for x
    x = 31,901,968,875.55/259,454.60
  6. Step 6: Final answer
    x = 122,957.81

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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.