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Finding the Fourth Proportional to 81,425.80, 122,138.70 and 34,683.40

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Solution

The fourth proportional to 81,425.80, 122,138.70 and 34,683.40 is: 52,025.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,425.80 : 122,138.70 = 34,683.40 : x
  2. Step 2: Convert to fraction form
    81,425.80/122,138.70 = 34,683.40/x
  3. Step 3: Cross multiply
    81,425.80x = 122,138.70 × 34,683.40
  4. Step 4: Simplify right side
    81,425.80x = 4,236,185,387.58
  5. Step 5: Solve for x
    x = 4,236,185,387.58/81,425.80
  6. Step 6: Final answer
    x = 52,025.10

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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.