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Finding the Fourth Proportional to 81,483.30, 122,079.15 and 66,611.70

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Solution

The fourth proportional to 81,483.30, 122,079.15 and 66,611.70 is: 99,798.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,483.30 : 122,079.15 = 66,611.70 : x
  2. Step 2: Convert to fraction form
    81,483.30/122,079.15 = 66,611.70/x
  3. Step 3: Cross multiply
    81,483.30x = 122,079.15 × 66,611.70
  4. Step 4: Simplify right side
    81,483.30x = 8,131,899,716.06
  5. Step 5: Solve for x
    x = 8,131,899,716.06/81,483.30
  6. Step 6: Final answer
    x = 99,798.36

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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.