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Finding the Fourth Proportional to 128,706.26, 177,509.33 and 90,591.98

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Solution

The fourth proportional to 128,706.26, 177,509.33 and 90,591.98 is: 124,942.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.26 : 177,509.33 = 90,591.98 : x
  2. Step 2: Convert to fraction form
    128,706.26/177,509.33 = 90,591.98/x
  3. Step 3: Cross multiply
    128,706.26x = 177,509.33 × 90,591.98
  4. Step 4: Simplify right side
    128,706.26x = 16,080,922,343.43
  5. Step 5: Solve for x
    x = 16,080,922,343.43/128,706.26
  6. Step 6: Final answer
    x = 124,942.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.