Home / 137,078.20-189,147.90-80,507.80

Finding the Fourth Proportional to 137,078.20, 189,147.90 and 80,507.80

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Solution

The fourth proportional to 137,078.20, 189,147.90 and 80,507.80 is: 111,089.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,078.20 : 189,147.90 = 80,507.80 : x
  2. Step 2: Convert to fraction form
    137,078.20/189,147.90 = 80,507.80/x
  3. Step 3: Cross multiply
    137,078.20x = 189,147.90 × 80,507.80
  4. Step 4: Simplify right side
    137,078.20x = 15,227,881,303.62
  5. Step 5: Solve for x
    x = 15,227,881,303.62/137,078.20
  6. Step 6: Final answer
    x = 111,089.01

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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.