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Finding the Fourth Proportional to 128,172.99, 176,865.44 and 74,469.27

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Solution

The fourth proportional to 128,172.99, 176,865.44 and 74,469.27 is: 102,759.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,172.99 : 176,865.44 = 74,469.27 : x
  2. Step 2: Convert to fraction form
    128,172.99/176,865.44 = 74,469.27/x
  3. Step 3: Cross multiply
    128,172.99x = 176,865.44 × 74,469.27
  4. Step 4: Simplify right side
    128,172.99x = 13,171,039,832.68
  5. Step 5: Solve for x
    x = 13,171,039,832.68/128,172.99
  6. Step 6: Final answer
    x = 102,759.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.