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Finding the Fourth Proportional to 128,000.90, 192,001.35 and 81,460.10

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Solution

The fourth proportional to 128,000.90, 192,001.35 and 81,460.10 is: 122,190.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.90 : 192,001.35 = 81,460.10 : x
  2. Step 2: Convert to fraction form
    128,000.90/192,001.35 = 81,460.10/x
  3. Step 3: Cross multiply
    128,000.90x = 192,001.35 × 81,460.10
  4. Step 4: Simplify right side
    128,000.90x = 15,640,449,171.14
  5. Step 5: Solve for x
    x = 15,640,449,171.14/128,000.90
  6. Step 6: Final answer
    x = 122,190.15

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1.5x scale

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.