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Finding the Fourth Proportional to 259,963.56, 389,959.08 and 72,989.64

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Solution

The fourth proportional to 259,963.56, 389,959.08 and 72,989.64 is: 109,488.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,963.56 : 389,959.08 = 72,989.64 : x
  2. Step 2: Convert to fraction form
    259,963.56/389,959.08 = 72,989.64/x
  3. Step 3: Cross multiply
    259,963.56x = 389,959.08 × 72,989.64
  4. Step 4: Simplify right side
    259,963.56x = 28,462,972,863.93
  5. Step 5: Solve for x
    x = 28,462,972,863.93/259,963.56
  6. Step 6: Final answer
    x = 109,488.32

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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.