Home / 128,581.50-177,442.27-71,992.88

Finding the Fourth Proportional to 128,581.50, 177,442.27 and 71,992.88

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Solution

The fourth proportional to 128,581.50, 177,442.27 and 71,992.88 is: 99,350.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,581.50 : 177,442.27 = 71,992.88 : x
  2. Step 2: Convert to fraction form
    128,581.50/177,442.27 = 71,992.88/x
  3. Step 3: Cross multiply
    128,581.50x = 177,442.27 × 71,992.88
  4. Step 4: Simplify right side
    128,581.50x = 12,774,580,051.04
  5. Step 5: Solve for x
    x = 12,774,580,051.04/128,581.50
  6. Step 6: Final answer
    x = 99,350.06

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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.