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Finding the Fourth Proportional to 428,059.36, 642,187.43 and 128,545.59

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Solution

The fourth proportional to 428,059.36, 642,187.43 and 128,545.59 is: 192,847.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,059.36 : 642,187.43 = 128,545.59 : x
  2. Step 2: Convert to fraction form
    428,059.36/642,187.43 = 128,545.59/x
  3. Step 3: Cross multiply
    428,059.36x = 642,187.43 × 128,545.59
  4. Step 4: Simplify right side
    428,059.36x = 82,550,362,079.93
  5. Step 5: Solve for x
    x = 82,550,362,079.93/428,059.36
  6. Step 6: Final answer
    x = 192,847.93

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1.5x scale

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.