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Finding the Fourth Proportional to 138,858.52, 191,623.26 and 78,429.28

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Solution

The fourth proportional to 138,858.52, 191,623.26 and 78,429.28 is: 108,231.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,858.52 : 191,623.26 = 78,429.28 : x
  2. Step 2: Convert to fraction form
    138,858.52/191,623.26 = 78,429.28/x
  3. Step 3: Cross multiply
    138,858.52x = 191,623.26 × 78,429.28
  4. Step 4: Simplify right side
    138,858.52x = 15,028,874,313.05
  5. Step 5: Solve for x
    x = 15,028,874,313.05/138,858.52
  6. Step 6: Final answer
    x = 108,231.56

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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.