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Finding the Fourth Proportional to 81,611.55, 122,690.70 and 70,785.90

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Solution

The fourth proportional to 81,611.55, 122,690.70 and 70,785.90 is: 106,415.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,611.55 : 122,690.70 = 70,785.90 : x
  2. Step 2: Convert to fraction form
    81,611.55/122,690.70 = 70,785.90/x
  3. Step 3: Cross multiply
    81,611.55x = 122,690.70 × 70,785.90
  4. Step 4: Simplify right side
    81,611.55x = 8,684,771,621.13
  5. Step 5: Solve for x
    x = 8,684,771,621.13/81,611.55
  6. Step 6: Final answer
    x = 106,415.96

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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.