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Finding the Fourth Proportional to 428,451.57, 642,767.27 and 128,954.07

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Solution

The fourth proportional to 428,451.57, 642,767.27 and 128,954.07 is: 193,458.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,451.57 : 642,767.27 = 128,954.07 : x
  2. Step 2: Convert to fraction form
    428,451.57/642,767.27 = 128,954.07/x
  3. Step 3: Cross multiply
    428,451.57x = 642,767.27 × 128,954.07
  4. Step 4: Simplify right side
    428,451.57x = 82,887,454,884.52
  5. Step 5: Solve for x
    x = 82,887,454,884.52/428,451.57
  6. Step 6: Final answer
    x = 193,458.17

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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.