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Finding the Fourth Proportional to 81,369.55, 122,036.10 and 53,485.30

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Solution

The fourth proportional to 81,369.55, 122,036.10 and 53,485.30 is: 80,215.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,369.55 : 122,036.10 = 53,485.30 : x
  2. Step 2: Convert to fraction form
    81,369.55/122,036.10 = 53,485.30/x
  3. Step 3: Cross multiply
    81,369.55x = 122,036.10 × 53,485.30
  4. Step 4: Simplify right side
    81,369.55x = 6,527,137,419.33
  5. Step 5: Solve for x
    x = 6,527,137,419.33/81,369.55
  6. Step 6: Final answer
    x = 80,215.97

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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.