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Finding the Fourth Proportional to 423,745.12, 635,548.56 and 128,188

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Solution

The fourth proportional to 423,745.12, 635,548.56 and 128,188 is: 192,261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,745.12 : 635,548.56 = 128,188 : x
  2. Step 2: Convert to fraction form
    423,745.12/635,548.56 = 128,188/x
  3. Step 3: Cross multiply
    423,745.12x = 635,548.56 × 128,188
  4. Step 4: Simplify right side
    423,745.12x = 81,469,698,809.28
  5. Step 5: Solve for x
    x = 81,469,698,809.28/423,745.12
  6. Step 6: Final answer
    x = 192,261.09

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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.