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Finding the Fourth Proportional to 111,838.72, 154,286.57 and 66,490.98

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Solution

The fourth proportional to 111,838.72, 154,286.57 and 66,490.98 is: 91,727.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,838.72 : 154,286.57 = 66,490.98 : x
  2. Step 2: Convert to fraction form
    111,838.72/154,286.57 = 66,490.98/x
  3. Step 3: Cross multiply
    111,838.72x = 154,286.57 × 66,490.98
  4. Step 4: Simplify right side
    111,838.72x = 10,258,664,468.71
  5. Step 5: Solve for x
    x = 10,258,664,468.71/111,838.72
  6. Step 6: Final answer
    x = 91,727.31

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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.