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Finding the Fourth Proportional to 259,818.88, 389,684.40 and 72,787.36

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Solution

The fourth proportional to 259,818.88, 389,684.40 and 72,787.36 is: 109,168.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,818.88 : 389,684.40 = 72,787.36 : x
  2. Step 2: Convert to fraction form
    259,818.88/389,684.40 = 72,787.36/x
  3. Step 3: Cross multiply
    259,818.88x = 389,684.40 × 72,787.36
  4. Step 4: Simplify right side
    259,818.88x = 28,364,098,709.18
  5. Step 5: Solve for x
    x = 28,364,098,709.18/259,818.88
  6. Step 6: Final answer
    x = 109,168.74

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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.