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Finding the Fourth Proportional to 137,575.80, 189,865.80 and 80,998.20

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Solution

The fourth proportional to 137,575.80, 189,865.80 and 80,998.20 is: 111,784.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,575.80 : 189,865.80 = 80,998.20 : x
  2. Step 2: Convert to fraction form
    137,575.80/189,865.80 = 80,998.20/x
  3. Step 3: Cross multiply
    137,575.80x = 189,865.80 × 80,998.20
  4. Step 4: Simplify right side
    137,575.80x = 15,378,788,041.56
  5. Step 5: Solve for x
    x = 15,378,788,041.56/137,575.80
  6. Step 6: Final answer
    x = 111,784.11

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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.