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Finding the Fourth Proportional to 128,763.83, 177,696.24 and 71,405.57

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Solution

The fourth proportional to 128,763.83, 177,696.24 and 71,405.57 is: 98,540.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.83 : 177,696.24 = 71,405.57 : x
  2. Step 2: Convert to fraction form
    128,763.83/177,696.24 = 71,405.57/x
  3. Step 3: Cross multiply
    128,763.83x = 177,696.24 × 71,405.57
  4. Step 4: Simplify right side
    128,763.83x = 12,688,500,415.58
  5. Step 5: Solve for x
    x = 12,688,500,415.58/128,763.83
  6. Step 6: Final answer
    x = 98,540.87

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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.