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Finding the Fourth Proportional to 139,090.56, 191,945.02 and 75,428.34

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Solution

The fourth proportional to 139,090.56, 191,945.02 and 75,428.34 is: 104,091.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,090.56 : 191,945.02 = 75,428.34 : x
  2. Step 2: Convert to fraction form
    139,090.56/191,945.02 = 75,428.34/x
  3. Step 3: Cross multiply
    139,090.56x = 191,945.02 × 75,428.34
  4. Step 4: Simplify right side
    139,090.56x = 14,478,094,229.87
  5. Step 5: Solve for x
    x = 14,478,094,229.87/139,090.56
  6. Step 6: Final answer
    x = 104,091.13

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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.