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Finding the Fourth Proportional to 128,215.90, 192,481.80 and 80,830.90

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Solution

The fourth proportional to 128,215.90, 192,481.80 and 80,830.90 is: 121,345.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,215.90 : 192,481.80 = 80,830.90 : x
  2. Step 2: Convert to fraction form
    128,215.90/192,481.80 = 80,830.90/x
  3. Step 3: Cross multiply
    128,215.90x = 192,481.80 × 80,830.90
  4. Step 4: Simplify right side
    128,215.90x = 15,558,477,127.62
  5. Step 5: Solve for x
    x = 15,558,477,127.62/128,215.90
  6. Step 6: Final answer
    x = 121,345.93

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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.