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Finding the Fourth Proportional to 128,051.20, 192,076.80 and 83,814.40

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Solution

The fourth proportional to 128,051.20, 192,076.80 and 83,814.40 is: 125,721.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.20 : 192,076.80 = 83,814.40 : x
  2. Step 2: Convert to fraction form
    128,051.20/192,076.80 = 83,814.40/x
  3. Step 3: Cross multiply
    128,051.20x = 192,076.80 × 83,814.40
  4. Step 4: Simplify right side
    128,051.20x = 16,098,801,745.92
  5. Step 5: Solve for x
    x = 16,098,801,745.92/128,051.20
  6. Step 6: Final answer
    x = 125,721.60

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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.