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Finding the Fourth Proportional to 128,487.69, 192,620.79 and 49,657.23

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Solution

The fourth proportional to 128,487.69, 192,620.79 and 49,657.23 is: 74,443.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,487.69 : 192,620.79 = 49,657.23 : x
  2. Step 2: Convert to fraction form
    128,487.69/192,620.79 = 49,657.23/x
  3. Step 3: Cross multiply
    128,487.69x = 192,620.79 × 49,657.23
  4. Step 4: Simplify right side
    128,487.69x = 9,565,014,871.81
  5. Step 5: Solve for x
    x = 9,565,014,871.81/128,487.69
  6. Step 6: Final answer
    x = 74,443.04

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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.