Home / 428,201.25-642,277.17-128,675.40

Finding the Fourth Proportional to 428,201.25, 642,277.17 and 128,675.40

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Solution

The fourth proportional to 428,201.25, 642,277.17 and 128,675.40 is: 193,005.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,201.25 : 642,277.17 = 128,675.40 : x
  2. Step 2: Convert to fraction form
    428,201.25/642,277.17 = 128,675.40/x
  3. Step 3: Cross multiply
    428,201.25x = 642,277.17 × 128,675.40
  4. Step 4: Simplify right side
    428,201.25x = 82,645,271,760.62
  5. Step 5: Solve for x
    x = 82,645,271,760.62/428,201.25
  6. Step 6: Final answer
    x = 193,005.68

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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.