Home / 80,748.19-121,121.20-28,157.50

Finding the Fourth Proportional to 80,748.19, 121,121.20 and 28,157.50

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Solution

The fourth proportional to 80,748.19, 121,121.20 and 28,157.50 is: 42,235.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,748.19 : 121,121.20 = 28,157.50 : x
  2. Step 2: Convert to fraction form
    80,748.19/121,121.20 = 28,157.50/x
  3. Step 3: Cross multiply
    80,748.19x = 121,121.20 × 28,157.50
  4. Step 4: Simplify right side
    80,748.19x = 3,410,470,189
  5. Step 5: Solve for x
    x = 3,410,470,189/80,748.19
  6. Step 6: Final answer
    x = 42,235.87

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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.