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Finding the Fourth Proportional to 428,455.08, 642,772.52 and 128,957.56

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Solution

The fourth proportional to 428,455.08, 642,772.52 and 128,957.56 is: 193,463.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,455.08 : 642,772.52 = 128,957.56 : x
  2. Step 2: Convert to fraction form
    428,455.08/642,772.52 = 128,957.56/x
  3. Step 3: Cross multiply
    428,455.08x = 642,772.52 × 128,957.56
  4. Step 4: Simplify right side
    428,455.08x = 82,890,375,814.25
  5. Step 5: Solve for x
    x = 82,890,375,814.25/428,455.08
  6. Step 6: Final answer
    x = 193,463.40

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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.