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Finding the Fourth Proportional to 128,768.63, 177,711.66 and 72,190.94

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Solution

The fourth proportional to 128,768.63, 177,711.66 and 72,190.94 is: 99,629.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,768.63 : 177,711.66 = 72,190.94 : x
  2. Step 2: Convert to fraction form
    128,768.63/177,711.66 = 72,190.94/x
  3. Step 3: Cross multiply
    128,768.63x = 177,711.66 × 72,190.94
  4. Step 4: Simplify right side
    128,768.63x = 12,829,170,895.80
  5. Step 5: Solve for x
    x = 12,829,170,895.80/128,768.63
  6. Step 6: Final answer
    x = 99,629.63

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1.5x scale

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.