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Finding the Fourth Proportional to 111,963.84, 154,529.28 and 76,129.44

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Solution

The fourth proportional to 111,963.84, 154,529.28 and 76,129.44 is: 105,071.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,963.84 : 154,529.28 = 76,129.44 : x
  2. Step 2: Convert to fraction form
    111,963.84/154,529.28 = 76,129.44/x
  3. Step 3: Cross multiply
    111,963.84x = 154,529.28 × 76,129.44
  4. Step 4: Simplify right side
    111,963.84x = 11,764,227,550.00
  5. Step 5: Solve for x
    x = 11,764,227,550.00/111,963.84
  6. Step 6: Final answer
    x = 105,071.67

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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.