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Finding the Fourth Proportional to 90,837.20, 136,255.80 and 81,651.80

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Solution

The fourth proportional to 90,837.20, 136,255.80 and 81,651.80 is: 122,477.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,837.20 : 136,255.80 = 81,651.80 : x
  2. Step 2: Convert to fraction form
    90,837.20/136,255.80 = 81,651.80/x
  3. Step 3: Cross multiply
    90,837.20x = 136,255.80 × 81,651.80
  4. Step 4: Simplify right side
    90,837.20x = 11,125,531,330.44
  5. Step 5: Solve for x
    x = 11,125,531,330.44/90,837.20
  6. Step 6: Final answer
    x = 122,477.70

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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.