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Finding the Fourth Proportional to 128,021.70, 192,032.55 and 81,308.10

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Solution

The fourth proportional to 128,021.70, 192,032.55 and 81,308.10 is: 121,962.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.70 : 192,032.55 = 81,308.10 : x
  2. Step 2: Convert to fraction form
    128,021.70/192,032.55 = 81,308.10/x
  3. Step 3: Cross multiply
    128,021.70x = 192,032.55 × 81,308.10
  4. Step 4: Simplify right side
    128,021.70x = 15,613,801,778.66
  5. Step 5: Solve for x
    x = 15,613,801,778.66/128,021.70
  6. Step 6: Final answer
    x = 121,962.15

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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.