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Finding the Fourth Proportional to 90,811.20, 136,216.80 and 81,625.80

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Solution

The fourth proportional to 90,811.20, 136,216.80 and 81,625.80 is: 122,438.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,811.20 : 136,216.80 = 81,625.80 : x
  2. Step 2: Convert to fraction form
    90,811.20/136,216.80 = 81,625.80/x
  3. Step 3: Cross multiply
    90,811.20x = 136,216.80 × 81,625.80
  4. Step 4: Simplify right side
    90,811.20x = 11,118,805,273.44
  5. Step 5: Solve for x
    x = 11,118,805,273.44/90,811.20
  6. Step 6: Final answer
    x = 122,438.70

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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.