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Finding the Fourth Proportional to 111,207.70, 166,811.55 and 81,756.10

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Solution

The fourth proportional to 111,207.70, 166,811.55 and 81,756.10 is: 122,634.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,207.70 : 166,811.55 = 81,756.10 : x
  2. Step 2: Convert to fraction form
    111,207.70/166,811.55 = 81,756.10/x
  3. Step 3: Cross multiply
    111,207.70x = 166,811.55 × 81,756.10
  4. Step 4: Simplify right side
    111,207.70x = 13,637,861,762.96
  5. Step 5: Solve for x
    x = 13,637,861,762.96/111,207.70
  6. Step 6: Final answer
    x = 122,634.15

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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.