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Finding the Fourth Proportional to 138,751.99, 191,431.00 and 90,331.81

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Solution

The fourth proportional to 138,751.99, 191,431.00 and 90,331.81 is: 124,627.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,751.99 : 191,431.00 = 90,331.81 : x
  2. Step 2: Convert to fraction form
    138,751.99/191,431.00 = 90,331.81/x
  3. Step 3: Cross multiply
    138,751.99x = 191,431.00 × 90,331.81
  4. Step 4: Simplify right side
    138,751.99x = 17,292,307,846.33
  5. Step 5: Solve for x
    x = 17,292,307,846.33/138,751.99
  6. Step 6: Final answer
    x = 124,627.46

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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.