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Finding the Fourth Proportional to 137,999.80, 206,999.70 and 122,966.20

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Solution

The fourth proportional to 137,999.80, 206,999.70 and 122,966.20 is: 184,449.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,999.80 : 206,999.70 = 122,966.20 : x
  2. Step 2: Convert to fraction form
    137,999.80/206,999.70 = 122,966.20/x
  3. Step 3: Cross multiply
    137,999.80x = 206,999.70 × 122,966.20
  4. Step 4: Simplify right side
    137,999.80x = 25,453,966,510.14
  5. Step 5: Solve for x
    x = 25,453,966,510.14/137,999.80
  6. Step 6: Final answer
    x = 184,449.30

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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.