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Finding the Fourth Proportional to 90,859.20, 136,029.60 and 80,491.20

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Solution

The fourth proportional to 90,859.20, 136,029.60 and 80,491.20 is: 120,507.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,859.20 : 136,029.60 = 80,491.20 : x
  2. Step 2: Convert to fraction form
    90,859.20/136,029.60 = 80,491.20/x
  3. Step 3: Cross multiply
    90,859.20x = 136,029.60 × 80,491.20
  4. Step 4: Simplify right side
    90,859.20x = 10,949,185,739.52
  5. Step 5: Solve for x
    x = 10,949,185,739.52/90,859.20
  6. Step 6: Final answer
    x = 120,507.18

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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.