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Finding the Fourth Proportional to 220,938.40, 331,407.60 and 121,405.60

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Solution

The fourth proportional to 220,938.40, 331,407.60 and 121,405.60 is: 182,108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,938.40 : 331,407.60 = 121,405.60 : x
  2. Step 2: Convert to fraction form
    220,938.40/331,407.60 = 121,405.60/x
  3. Step 3: Cross multiply
    220,938.40x = 331,407.60 × 121,405.60
  4. Step 4: Simplify right side
    220,938.40x = 40,234,738,522.56
  5. Step 5: Solve for x
    x = 40,234,738,522.56/220,938.40
  6. Step 6: Final answer
    x = 182,108.40

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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.