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Finding the Fourth Proportional to 81,807.70, 122,711.55 and 72,622.30

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Solution

The fourth proportional to 81,807.70, 122,711.55 and 72,622.30 is: 108,933.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,807.70 : 122,711.55 = 72,622.30 : x
  2. Step 2: Convert to fraction form
    81,807.70/122,711.55 = 72,622.30/x
  3. Step 3: Cross multiply
    81,807.70x = 122,711.55 × 72,622.30
  4. Step 4: Simplify right side
    81,807.70x = 8,911,594,997.57
  5. Step 5: Solve for x
    x = 8,911,594,997.57/81,807.70
  6. Step 6: Final answer
    x = 108,933.45

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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.