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Finding the Fourth Proportional to 207,115.12, 310,790.64 and 80,738.88

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Solution

The fourth proportional to 207,115.12, 310,790.64 and 80,738.88 is: 121,154.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,115.12 : 310,790.64 = 80,738.88 : x
  2. Step 2: Convert to fraction form
    207,115.12/310,790.64 = 80,738.88/x
  3. Step 3: Cross multiply
    207,115.12x = 310,790.64 × 80,738.88
  4. Step 4: Simplify right side
    207,115.12x = 25,092,888,188.08
  5. Step 5: Solve for x
    x = 25,092,888,188.08/207,115.12
  6. Step 6: Final answer
    x = 121,154.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.