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Finding the Fourth Proportional to 81,312.70, 122,007.93 and 63,816.70

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Solution

The fourth proportional to 81,312.70, 122,007.93 and 63,816.70 is: 95,755.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,312.70 : 122,007.93 = 63,816.70 : x
  2. Step 2: Convert to fraction form
    81,312.70/122,007.93 = 63,816.70/x
  3. Step 3: Cross multiply
    81,312.70x = 122,007.93 × 63,816.70
  4. Step 4: Simplify right side
    81,312.70x = 7,786,143,466.43
  5. Step 5: Solve for x
    x = 7,786,143,466.43/81,312.70
  6. Step 6: Final answer
    x = 95,755.56

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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.