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Finding the Fourth Proportional to 128,139.40, 192,209.10 and 115,454.80

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Solution

The fourth proportional to 128,139.40, 192,209.10 and 115,454.80 is: 173,182.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,139.40 : 192,209.10 = 115,454.80 : x
  2. Step 2: Convert to fraction form
    128,139.40/192,209.10 = 115,454.80/x
  3. Step 3: Cross multiply
    128,139.40x = 192,209.10 × 115,454.80
  4. Step 4: Simplify right side
    128,139.40x = 22,191,463,198.68
  5. Step 5: Solve for x
    x = 22,191,463,198.68/128,139.40
  6. Step 6: Final answer
    x = 173,182.20

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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.