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Finding the Fourth Proportional to 128,467.70, 192,701.55 and 84,230.90

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Solution

The fourth proportional to 128,467.70, 192,701.55 and 84,230.90 is: 126,346.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,467.70 : 192,701.55 = 84,230.90 : x
  2. Step 2: Convert to fraction form
    128,467.70/192,701.55 = 84,230.90/x
  3. Step 3: Cross multiply
    128,467.70x = 192,701.55 × 84,230.90
  4. Step 4: Simplify right side
    128,467.70x = 16,231,424,987.90
  5. Step 5: Solve for x
    x = 16,231,424,987.90/128,467.70
  6. Step 6: Final answer
    x = 126,346.35

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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.