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Finding the Fourth Proportional to 128,424.40, 192,636.60 and 115,334.80

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Solution

The fourth proportional to 128,424.40, 192,636.60 and 115,334.80 is: 173,002.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,424.40 : 192,636.60 = 115,334.80 : x
  2. Step 2: Convert to fraction form
    128,424.40/192,636.60 = 115,334.80/x
  3. Step 3: Cross multiply
    128,424.40x = 192,636.60 × 115,334.80
  4. Step 4: Simplify right side
    128,424.40x = 22,217,703,733.68
  5. Step 5: Solve for x
    x = 22,217,703,733.68/128,424.40
  6. Step 6: Final answer
    x = 173,002.20

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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.