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Finding the Fourth Proportional to 128,696.76, 177,601.41 and 72,108.54

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Solution

The fourth proportional to 128,696.76, 177,601.41 and 72,108.54 is: 99,509.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,696.76 : 177,601.41 = 72,108.54 : x
  2. Step 2: Convert to fraction form
    128,696.76/177,601.41 = 72,108.54/x
  3. Step 3: Cross multiply
    128,696.76x = 177,601.41 × 72,108.54
  4. Step 4: Simplify right side
    128,696.76x = 12,806,578,377.04
  5. Step 5: Solve for x
    x = 12,806,578,377.04/128,696.76
  6. Step 6: Final answer
    x = 99,509.72

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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.