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Finding the Fourth Proportional to 111,290.60, 166,935.90 and 81,766.10

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Solution

The fourth proportional to 111,290.60, 166,935.90 and 81,766.10 is: 122,649.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,290.60 : 166,935.90 = 81,766.10 : x
  2. Step 2: Convert to fraction form
    111,290.60/166,935.90 = 81,766.10/x
  3. Step 3: Cross multiply
    111,290.60x = 166,935.90 × 81,766.10
  4. Step 4: Simplify right side
    111,290.60x = 13,649,697,492.99
  5. Step 5: Solve for x
    x = 13,649,697,492.99/111,290.60
  6. Step 6: Final answer
    x = 122,649.15

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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.