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Finding the Fourth Proportional to 81,004.88, 121,665.01 and 66,023.08

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Solution

The fourth proportional to 81,004.88, 121,665.01 and 66,023.08 is: 99,163.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,004.88 : 121,665.01 = 66,023.08 : x
  2. Step 2: Convert to fraction form
    81,004.88/121,665.01 = 66,023.08/x
  3. Step 3: Cross multiply
    81,004.88x = 121,665.01 × 66,023.08
  4. Step 4: Simplify right side
    81,004.88x = 8,032,698,080.11
  5. Step 5: Solve for x
    x = 8,032,698,080.11/81,004.88
  6. Step 6: Final answer
    x = 99,163.14

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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.