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Finding the Fourth Proportional to 218,115.10, 300,999.31 and 122,622.58

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Solution

The fourth proportional to 218,115.10, 300,999.31 and 122,622.58 is: 169,219.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,115.10 : 300,999.31 = 122,622.58 : x
  2. Step 2: Convert to fraction form
    218,115.10/300,999.31 = 122,622.58/x
  3. Step 3: Cross multiply
    218,115.10x = 300,999.31 × 122,622.58
  4. Step 4: Simplify right side
    218,115.10x = 36,909,311,970.42
  5. Step 5: Solve for x
    x = 36,909,311,970.42/218,115.10
  6. Step 6: Final answer
    x = 169,219.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.