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Finding the Fourth Proportional to 218,489.80, 301,516.42 and 121,692.88

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Solution

The fourth proportional to 218,489.80, 301,516.42 and 121,692.88 is: 167,936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,489.80 : 301,516.42 = 121,692.88 : x
  2. Step 2: Convert to fraction form
    218,489.80/301,516.42 = 121,692.88/x
  3. Step 3: Cross multiply
    218,489.80x = 301,516.42 × 121,692.88
  4. Step 4: Simplify right side
    218,489.80x = 36,692,401,517.09
  5. Step 5: Solve for x
    x = 36,692,401,517.09/218,489.80
  6. Step 6: Final answer
    x = 167,936.45

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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.