Home / 428,459.08-642,778.52-128,961.56

Finding the Fourth Proportional to 428,459.08, 642,778.52 and 128,961.56

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Solution

The fourth proportional to 428,459.08, 642,778.52 and 128,961.56 is: 193,469.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,459.08 : 642,778.52 = 128,961.56 : x
  2. Step 2: Convert to fraction form
    428,459.08/642,778.52 = 128,961.56/x
  3. Step 3: Cross multiply
    428,459.08x = 642,778.52 × 128,961.56
  4. Step 4: Simplify right side
    428,459.08x = 82,893,720,673.69
  5. Step 5: Solve for x
    x = 82,893,720,673.69/428,459.08
  6. Step 6: Final answer
    x = 193,469.40

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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.