Home / 128,578.86-177,453.99-71,979.30

Finding the Fourth Proportional to 128,578.86, 177,453.99 and 71,979.30

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Solution

The fourth proportional to 128,578.86, 177,453.99 and 71,979.30 is: 99,339.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.86 : 177,453.99 = 71,979.30 : x
  2. Step 2: Convert to fraction form
    128,578.86/177,453.99 = 71,979.30/x
  3. Step 3: Cross multiply
    128,578.86x = 177,453.99 × 71,979.30
  4. Step 4: Simplify right side
    128,578.86x = 12,773,013,982.41
  5. Step 5: Solve for x
    x = 12,773,013,982.41/128,578.86
  6. Step 6: Final answer
    x = 99,339.92

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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.