Home / 128,942.80-177,938.16-71,578.73

Finding the Fourth Proportional to 128,942.80, 177,938.16 and 71,578.73

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Solution

The fourth proportional to 128,942.80, 177,938.16 and 71,578.73 is: 98,777.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,942.80 : 177,938.16 = 71,578.73 : x
  2. Step 2: Convert to fraction form
    128,942.80/177,938.16 = 71,578.73/x
  3. Step 3: Cross multiply
    128,942.80x = 177,938.16 × 71,578.73
  4. Step 4: Simplify right side
    128,942.80x = 12,736,587,511.34
  5. Step 5: Solve for x
    x = 12,736,587,511.34/128,942.80
  6. Step 6: Final answer
    x = 98,777.04

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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.