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Finding the Fourth Proportional to 81,737.85, 122,653.35 and 31,811.49

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Solution

The fourth proportional to 81,737.85, 122,653.35 and 31,811.49 is: 47,735.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,737.85 : 122,653.35 = 31,811.49 : x
  2. Step 2: Convert to fraction form
    81,737.85/122,653.35 = 31,811.49/x
  3. Step 3: Cross multiply
    81,737.85x = 122,653.35 × 31,811.49
  4. Step 4: Simplify right side
    81,737.85x = 3,901,785,816.99
  5. Step 5: Solve for x
    x = 3,901,785,816.99/81,737.85
  6. Step 6: Final answer
    x = 47,735.36

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1.5x scale

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.