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Finding the Fourth Proportional to 128,053.20, 192,079.80 and 83,816.40

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Solution

The fourth proportional to 128,053.20, 192,079.80 and 83,816.40 is: 125,724.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,053.20 : 192,079.80 = 83,816.40 : x
  2. Step 2: Convert to fraction form
    128,053.20/192,079.80 = 83,816.40/x
  3. Step 3: Cross multiply
    128,053.20x = 192,079.80 × 83,816.40
  4. Step 4: Simplify right side
    128,053.20x = 16,099,437,348.72
  5. Step 5: Solve for x
    x = 16,099,437,348.72/128,053.20
  6. Step 6: Final answer
    x = 125,724.60

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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.