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Finding the Fourth Proportional to 81,686.16, 122,632.92 and 69,451.92

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Solution

The fourth proportional to 81,686.16, 122,632.92 and 69,451.92 is: 104,266.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,686.16 : 122,632.92 = 69,451.92 : x
  2. Step 2: Convert to fraction form
    81,686.16/122,632.92 = 69,451.92/x
  3. Step 3: Cross multiply
    81,686.16x = 122,632.92 × 69,451.92
  4. Step 4: Simplify right side
    81,686.16x = 8,517,091,749.21
  5. Step 5: Solve for x
    x = 8,517,091,749.21/81,686.16
  6. Step 6: Final answer
    x = 104,266.03

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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.