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Finding the Fourth Proportional to 102,644.80, 153,823.20 and 81,620.80

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Solution

The fourth proportional to 102,644.80, 153,823.20 and 81,620.80 is: 122,316.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,644.80 : 153,823.20 = 81,620.80 : x
  2. Step 2: Convert to fraction form
    102,644.80/153,823.20 = 81,620.80/x
  3. Step 3: Cross multiply
    102,644.80x = 153,823.20 × 81,620.80
  4. Step 4: Simplify right side
    102,644.80x = 12,555,172,642.56
  5. Step 5: Solve for x
    x = 12,555,172,642.56/102,644.80
  6. Step 6: Final answer
    x = 122,316.69

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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.