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Finding the Fourth Proportional to 128,807.40, 193,173.42 and 49,902.86

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Solution

The fourth proportional to 128,807.40, 193,173.42 and 49,902.86 is: 74,839.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,807.40 : 193,173.42 = 49,902.86 : x
  2. Step 2: Convert to fraction form
    128,807.40/193,173.42 = 49,902.86/x
  3. Step 3: Cross multiply
    128,807.40x = 193,173.42 × 49,902.86
  4. Step 4: Simplify right side
    128,807.40x = 9,639,906,133.98
  5. Step 5: Solve for x
    x = 9,639,906,133.98/128,807.40
  6. Step 6: Final answer
    x = 74,839.69

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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.