Home / 128,331-177,093.54-71,742.78

Finding the Fourth Proportional to 128,331, 177,093.54 and 71,742.78

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Solution

The fourth proportional to 128,331, 177,093.54 and 71,742.78 is: 99,003.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,331 : 177,093.54 = 71,742.78 : x
  2. Step 2: Convert to fraction form
    128,331/177,093.54 = 71,742.78/x
  3. Step 3: Cross multiply
    128,331x = 177,093.54 × 71,742.78
  4. Step 4: Simplify right side
    128,331x = 12,705,182,879.64
  5. Step 5: Solve for x
    x = 12,705,182,879.64/128,331
  6. Step 6: Final answer
    x = 99,003.23

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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.