Home / 128,629.62-177,511.32-72,040.86

Finding the Fourth Proportional to 128,629.62, 177,511.32 and 72,040.86

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Solution

The fourth proportional to 128,629.62, 177,511.32 and 72,040.86 is: 99,417.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.62 : 177,511.32 = 72,040.86 : x
  2. Step 2: Convert to fraction form
    128,629.62/177,511.32 = 72,040.86/x
  3. Step 3: Cross multiply
    128,629.62x = 177,511.32 × 72,040.86
  4. Step 4: Simplify right side
    128,629.62x = 12,788,068,152.54
  5. Step 5: Solve for x
    x = 12,788,068,152.54/128,629.62
  6. Step 6: Final answer
    x = 99,417.76

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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.