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Finding the Fourth Proportional to 138,991.68, 208,485.78 and 33,810.72

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Solution

The fourth proportional to 138,991.68, 208,485.78 and 33,810.72 is: 50,715.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,991.68 : 208,485.78 = 33,810.72 : x
  2. Step 2: Convert to fraction form
    138,991.68/208,485.78 = 33,810.72/x
  3. Step 3: Cross multiply
    138,991.68x = 208,485.78 × 33,810.72
  4. Step 4: Simplify right side
    138,991.68x = 7,049,054,331.56
  5. Step 5: Solve for x
    x = 7,049,054,331.56/138,991.68
  6. Step 6: Final answer
    x = 50,715.66

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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.