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Finding the Fourth Proportional to 81,390, 122,639.59 and 66,923

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Solution

The fourth proportional to 81,390, 122,639.59 and 66,923 is: 100,840.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390 : 122,639.59 = 66,923 : x
  2. Step 2: Convert to fraction form
    81,390/122,639.59 = 66,923/x
  3. Step 3: Cross multiply
    81,390x = 122,639.59 × 66,923
  4. Step 4: Simplify right side
    81,390x = 8,207,409,281.57
  5. Step 5: Solve for x
    x = 8,207,409,281.57/81,390
  6. Step 6: Final answer
    x = 100,840.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.