Home / 128,997.33-178,012.98-71,635.20

Finding the Fourth Proportional to 128,997.33, 178,012.98 and 71,635.20

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Solution

The fourth proportional to 128,997.33, 178,012.98 and 71,635.20 is: 98,854.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,997.33 : 178,012.98 = 71,635.20 : x
  2. Step 2: Convert to fraction form
    128,997.33/178,012.98 = 71,635.20/x
  3. Step 3: Cross multiply
    128,997.33x = 178,012.98 × 71,635.20
  4. Step 4: Simplify right side
    128,997.33x = 12,751,995,424.90
  5. Step 5: Solve for x
    x = 12,751,995,424.90/128,997.33
  6. Step 6: Final answer
    x = 98,854.72

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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.