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Finding the Fourth Proportional to 128,001.40, 192,002.10 and 81,460.60

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Solution

The fourth proportional to 128,001.40, 192,002.10 and 81,460.60 is: 122,190.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.40 : 192,002.10 = 81,460.60 : x
  2. Step 2: Convert to fraction form
    128,001.40/192,002.10 = 81,460.60/x
  3. Step 3: Cross multiply
    128,001.40x = 192,002.10 × 81,460.60
  4. Step 4: Simplify right side
    128,001.40x = 15,640,606,267.26
  5. Step 5: Solve for x
    x = 15,640,606,267.26/128,001.40
  6. Step 6: Final answer
    x = 122,190.90

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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.