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Finding the Fourth Proportional to 128,769.27, 193,209.40 and 69,646.56

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Solution

The fourth proportional to 128,769.27, 193,209.40 and 69,646.56 is: 104,499.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,769.27 : 193,209.40 = 69,646.56 : x
  2. Step 2: Convert to fraction form
    128,769.27/193,209.40 = 69,646.56/x
  3. Step 3: Cross multiply
    128,769.27x = 193,209.40 × 69,646.56
  4. Step 4: Simplify right side
    128,769.27x = 13,456,369,673.70
  5. Step 5: Solve for x
    x = 13,456,369,673.70/128,769.27
  6. Step 6: Final answer
    x = 104,499.85

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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.