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Finding the Fourth Proportional to 81,990.90, 122,986.35 and 55,746.90

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Solution

The fourth proportional to 81,990.90, 122,986.35 and 55,746.90 is: 83,620.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,990.90 : 122,986.35 = 55,746.90 : x
  2. Step 2: Convert to fraction form
    81,990.90/122,986.35 = 55,746.90/x
  3. Step 3: Cross multiply
    81,990.90x = 122,986.35 × 55,746.90
  4. Step 4: Simplify right side
    81,990.90x = 6,856,107,754.82
  5. Step 5: Solve for x
    x = 6,856,107,754.82/81,990.90
  6. Step 6: Final answer
    x = 83,620.35

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Similar ratio
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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.