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Finding the Fourth Proportional to 128,613.75, 192,949.80 and 45,507.75

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Solution

The fourth proportional to 128,613.75, 192,949.80 and 45,507.75 is: 68,271.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,613.75 : 192,949.80 = 45,507.75 : x
  2. Step 2: Convert to fraction form
    128,613.75/192,949.80 = 45,507.75/x
  3. Step 3: Cross multiply
    128,613.75x = 192,949.80 × 45,507.75
  4. Step 4: Simplify right side
    128,613.75x = 8,780,711,260.95
  5. Step 5: Solve for x
    x = 8,780,711,260.95/128,613.75
  6. Step 6: Final answer
    x = 68,271.95

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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.