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Finding the Fourth Proportional to 145,661.96, 201,010.41 and 81,131.00

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Solution

The fourth proportional to 145,661.96, 201,010.41 and 81,131.00 is: 111,959.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,661.96 : 201,010.41 = 81,131.00 : x
  2. Step 2: Convert to fraction form
    145,661.96/201,010.41 = 81,131.00/x
  3. Step 3: Cross multiply
    145,661.96x = 201,010.41 × 81,131.00
  4. Step 4: Simplify right side
    145,661.96x = 16,308,174,568.66
  5. Step 5: Solve for x
    x = 16,308,174,568.66/145,661.96
  6. Step 6: Final answer
    x = 111,959.05

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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.