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Finding the Fourth Proportional to 252,880.90, 379,430.70 and 128,221.90

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Solution

The fourth proportional to 252,880.90, 379,430.70 and 128,221.90 is: 192,388.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    252,880.90 : 379,430.70 = 128,221.90 : x
  2. Step 2: Convert to fraction form
    252,880.90/379,430.70 = 128,221.90/x
  3. Step 3: Cross multiply
    252,880.90x = 379,430.70 × 128,221.90
  4. Step 4: Simplify right side
    252,880.90x = 48,651,325,272.33
  5. Step 5: Solve for x
    x = 48,651,325,272.33/252,880.90
  6. Step 6: Final answer
    x = 192,388.30

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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.