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Finding the Fourth Proportional to 128,609.50, 177,481.20 and 72,022.18

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Solution

The fourth proportional to 128,609.50, 177,481.20 and 72,022.18 is: 99,390.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.50 : 177,481.20 = 72,022.18 : x
  2. Step 2: Convert to fraction form
    128,609.50/177,481.20 = 72,022.18/x
  3. Step 3: Cross multiply
    128,609.50x = 177,481.20 × 72,022.18
  4. Step 4: Simplify right side
    128,609.50x = 12,782,582,933.02
  5. Step 5: Solve for x
    x = 12,782,582,933.02/128,609.50
  6. Step 6: Final answer
    x = 99,390.66

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1.5x scale

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.