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Finding the Fourth Proportional to 137,622.80, 206,555.70 and 81,392.60

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Solution

The fourth proportional to 137,622.80, 206,555.70 and 81,392.60 is: 122,160.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,622.80 : 206,555.70 = 81,392.60 : x
  2. Step 2: Convert to fraction form
    137,622.80/206,555.70 = 81,392.60/x
  3. Step 3: Cross multiply
    137,622.80x = 206,555.70 × 81,392.60
  4. Step 4: Simplify right side
    137,622.80x = 16,812,105,467.82
  5. Step 5: Solve for x
    x = 16,812,105,467.82/137,622.80
  6. Step 6: Final answer
    x = 122,160.76

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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.