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Finding the Fourth Proportional to 128,900.97, 177,884.56 and 72,313.56

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Solution

The fourth proportional to 128,900.97, 177,884.56 and 72,313.56 is: 99,793.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,900.97 : 177,884.56 = 72,313.56 : x
  2. Step 2: Convert to fraction form
    128,900.97/177,884.56 = 72,313.56/x
  3. Step 3: Cross multiply
    128,900.97x = 177,884.56 × 72,313.56
  4. Step 4: Simplify right side
    128,900.97x = 12,863,465,441.07
  5. Step 5: Solve for x
    x = 12,863,465,441.07/128,900.97
  6. Step 6: Final answer
    x = 99,793.40

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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.