Home / 128,709.06-177,618.18-72,120.43

Finding the Fourth Proportional to 128,709.06, 177,618.18 and 72,120.43

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Solution

The fourth proportional to 128,709.06, 177,618.18 and 72,120.43 is: 99,526.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.06 : 177,618.18 = 72,120.43 : x
  2. Step 2: Convert to fraction form
    128,709.06/177,618.18 = 72,120.43/x
  3. Step 3: Cross multiply
    128,709.06x = 177,618.18 × 72,120.43
  4. Step 4: Simplify right side
    128,709.06x = 12,809,899,517.42
  5. Step 5: Solve for x
    x = 12,809,899,517.42/128,709.06
  6. Step 6: Final answer
    x = 99,526.01

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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.