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Finding the Fourth Proportional to 428,325.88, 642,376.86 and 128,726.32

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Solution

The fourth proportional to 428,325.88, 642,376.86 and 128,726.32 is: 193,055.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,325.88 : 642,376.86 = 128,726.32 : x
  2. Step 2: Convert to fraction form
    428,325.88/642,376.86 = 128,726.32/x
  3. Step 3: Cross multiply
    428,325.88x = 642,376.86 × 128,726.32
  4. Step 4: Simplify right side
    428,325.88x = 82,690,809,240.96
  5. Step 5: Solve for x
    x = 82,690,809,240.96/428,325.88
  6. Step 6: Final answer
    x = 193,055.83

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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.