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Finding the Fourth Proportional to 128,812.41, 177,764.63 and 72,222.57

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Solution

The fourth proportional to 128,812.41, 177,764.63 and 72,222.57 is: 99,669.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,812.41 : 177,764.63 = 72,222.57 : x
  2. Step 2: Convert to fraction form
    128,812.41/177,764.63 = 72,222.57/x
  3. Step 3: Cross multiply
    128,812.41x = 177,764.63 × 72,222.57
  4. Step 4: Simplify right side
    128,812.41x = 12,838,618,072.59
  5. Step 5: Solve for x
    x = 12,838,618,072.59/128,812.41
  6. Step 6: Final answer
    x = 99,669.11

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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.