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Finding the Fourth Proportional to 81,447.86, 122,726.68 and 66,980.86

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Solution

The fourth proportional to 81,447.86, 122,726.68 and 66,980.86 is: 100,927.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,447.86 : 122,726.68 = 66,980.86 : x
  2. Step 2: Convert to fraction form
    81,447.86/122,726.68 = 66,980.86/x
  3. Step 3: Cross multiply
    81,447.86x = 122,726.68 × 66,980.86
  4. Step 4: Simplify right side
    81,447.86x = 8,220,338,571.34
  5. Step 5: Solve for x
    x = 8,220,338,571.34/81,447.86
  6. Step 6: Final answer
    x = 100,927.62

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1.5x scale

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.