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Finding the Fourth Proportional to 308,212.65, 462,407.54 and 128,263.05

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Solution

The fourth proportional to 308,212.65, 462,407.54 and 128,263.05 is: 192,431.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,212.65 : 462,407.54 = 128,263.05 : x
  2. Step 2: Convert to fraction form
    308,212.65/462,407.54 = 128,263.05/x
  3. Step 3: Cross multiply
    308,212.65x = 462,407.54 × 128,263.05
  4. Step 4: Simplify right side
    308,212.65x = 59,309,800,782.08
  5. Step 5: Solve for x
    x = 59,309,800,782.08/308,212.65
  6. Step 6: Final answer
    x = 192,431.43

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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.