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Finding the Fourth Proportional to 111,711.64, 154,138.80 and 66,405.64

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Solution

The fourth proportional to 111,711.64, 154,138.80 and 66,405.64 is: 91,625.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,711.64 : 154,138.80 = 66,405.64 : x
  2. Step 2: Convert to fraction form
    111,711.64/154,138.80 = 66,405.64/x
  3. Step 3: Cross multiply
    111,711.64x = 154,138.80 × 66,405.64
  4. Step 4: Simplify right side
    111,711.64x = 10,235,685,662.83
  5. Step 5: Solve for x
    x = 10,235,685,662.83/111,711.64
  6. Step 6: Final answer
    x = 91,625.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.