Home / 80,405.28-111,467.51-76,139.45

Finding the Fourth Proportional to 80,405.28, 111,467.51 and 76,139.45

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Solution

The fourth proportional to 80,405.28, 111,467.51 and 76,139.45 is: 105,553.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,405.28 : 111,467.51 = 76,139.45 : x
  2. Step 2: Convert to fraction form
    80,405.28/111,467.51 = 76,139.45/x
  3. Step 3: Cross multiply
    80,405.28x = 111,467.51 × 76,139.45
  4. Step 4: Simplify right side
    80,405.28x = 8,487,073,966.23
  5. Step 5: Solve for x
    x = 8,487,073,966.23/80,405.28
  6. Step 6: Final answer
    x = 105,553.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.