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Finding the Fourth Proportional to 128,279.87, 192,451.12 and 90,403.02

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Solution

The fourth proportional to 128,279.87, 192,451.12 and 90,403.02 is: 135,626.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,279.87 : 192,451.12 = 90,403.02 : x
  2. Step 2: Convert to fraction form
    128,279.87/192,451.12 = 90,403.02/x
  3. Step 3: Cross multiply
    128,279.87x = 192,451.12 × 90,403.02
  4. Step 4: Simplify right side
    128,279.87x = 17,398,162,732.89
  5. Step 5: Solve for x
    x = 17,398,162,732.89/128,279.87
  6. Step 6: Final answer
    x = 135,626.60

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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.