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Finding the Fourth Proportional to 81,477.90, 122,216.85 and 54,905.85

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Solution

The fourth proportional to 81,477.90, 122,216.85 and 54,905.85 is: 82,358.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,477.90 : 122,216.85 = 54,905.85 : x
  2. Step 2: Convert to fraction form
    81,477.90/122,216.85 = 54,905.85/x
  3. Step 3: Cross multiply
    81,477.90x = 122,216.85 × 54,905.85
  4. Step 4: Simplify right side
    81,477.90x = 6,710,420,033.57
  5. Step 5: Solve for x
    x = 6,710,420,033.57/81,477.90
  6. Step 6: Final answer
    x = 82,358.78

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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.