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Finding the Fourth Proportional to 128,728.54, 193,092.96 and 53,807.69

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Solution

The fourth proportional to 128,728.54, 193,092.96 and 53,807.69 is: 80,711.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,728.54 : 193,092.96 = 53,807.69 : x
  2. Step 2: Convert to fraction form
    128,728.54/193,092.96 = 53,807.69/x
  3. Step 3: Cross multiply
    128,728.54x = 193,092.96 × 53,807.69
  4. Step 4: Simplify right side
    128,728.54x = 10,389,886,817.37
  5. Step 5: Solve for x
    x = 10,389,886,817.37/128,728.54
  6. Step 6: Final answer
    x = 80,711.60

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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.