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Finding the Fourth Proportional to 128,846.91, 177,756.24 and 86,419.11

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Solution

The fourth proportional to 128,846.91, 177,756.24 and 86,419.11 is: 119,223.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,846.91 : 177,756.24 = 86,419.11 : x
  2. Step 2: Convert to fraction form
    128,846.91/177,756.24 = 86,419.11/x
  3. Step 3: Cross multiply
    128,846.91x = 177,756.24 × 86,419.11
  4. Step 4: Simplify right side
    128,846.91x = 15,361,536,057.75
  5. Step 5: Solve for x
    x = 15,361,536,057.75/128,846.91
  6. Step 6: Final answer
    x = 119,223.16

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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.