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Finding the Fourth Proportional to 128,770.88, 177,714.77 and 72,193.19

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Solution

The fourth proportional to 128,770.88, 177,714.77 and 72,193.19 is: 99,632.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,770.88 : 177,714.77 = 72,193.19 : x
  2. Step 2: Convert to fraction form
    128,770.88/177,714.77 = 72,193.19/x
  3. Step 3: Cross multiply
    128,770.88x = 177,714.77 × 72,193.19
  4. Step 4: Simplify right side
    128,770.88x = 12,829,794,906.88
  5. Step 5: Solve for x
    x = 12,829,794,906.88/128,770.88
  6. Step 6: Final answer
    x = 99,632.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.