Home / 428,171.96-642,291.12-128,629.04

Finding the Fourth Proportional to 428,171.96, 642,291.12 and 128,629.04

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Solution

The fourth proportional to 428,171.96, 642,291.12 and 128,629.04 is: 192,953.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,171.96 : 642,291.12 = 128,629.04 : x
  2. Step 2: Convert to fraction form
    428,171.96/642,291.12 = 128,629.04/x
  3. Step 3: Cross multiply
    428,171.96x = 642,291.12 × 128,629.04
  4. Step 4: Simplify right side
    428,171.96x = 82,617,290,166.12
  5. Step 5: Solve for x
    x = 82,617,290,166.12/428,171.96
  6. Step 6: Final answer
    x = 192,953.53

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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.