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Finding the Fourth Proportional to 128,308.67, 192,512.31 and 90,394.39

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Solution

The fourth proportional to 128,308.67, 192,512.31 and 90,394.39 is: 135,626.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,308.67 : 192,512.31 = 90,394.39 : x
  2. Step 2: Convert to fraction form
    128,308.67/192,512.31 = 90,394.39/x
  3. Step 3: Cross multiply
    128,308.67x = 192,512.31 × 90,394.39
  4. Step 4: Simplify right side
    128,308.67x = 17,402,032,829.94
  5. Step 5: Solve for x
    x = 17,402,032,829.94/128,308.67
  6. Step 6: Final answer
    x = 135,626.32

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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.