Home / 128,940.30-177,928.70-71,575.11

Finding the Fourth Proportional to 128,940.30, 177,928.70 and 71,575.11

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Solution

The fourth proportional to 128,940.30, 177,928.70 and 71,575.11 is: 98,768.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.30 : 177,928.70 = 71,575.11 : x
  2. Step 2: Convert to fraction form
    128,940.30/177,928.70 = 71,575.11/x
  3. Step 3: Cross multiply
    128,940.30x = 177,928.70 × 71,575.11
  4. Step 4: Simplify right side
    128,940.30x = 12,735,265,916.78
  5. Step 5: Solve for x
    x = 12,735,265,916.78/128,940.30
  6. Step 6: Final answer
    x = 98,768.70

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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.